I installed new spring in HW50S. It will not cock!

[Robert 5mm]

Web site states International shipping = 12.95 pounds

https://www.airrifletuning.com/product-category/tbt-tuning-kits/weihrauch-beeman/hw99-50-57/

[scrinja]

tinbumtuning@gmail.com    Uk

He has a supplier in Canada also
D&L Airguns

[SpiralGroove]

I will say from watching these videos I'm quite impressed with what I see! what is the cost shipped to the U.S. for 1 of these kits?

Yeah Mark,
The kits look good, but I think the most important takeaway from the videos is explaining to newer folks how airgun internals work and how best to fit a Spring or kit tune.
I've only bought one kit and ironically removed it didn't provide the benefit its marketing claimed.

Folks need to remember, the whole spring, top-hat, washers etc. (assembly) needs to fit completely into the piston when compressed or the gun won't cock ......... as upon cocking, the piston tang can't move rearward enough to engage the trigger sear. 
Measure spring coils dia. and number of coils to determine compressed length.  Make sure when adding top-hat, spacers or whatever .... that you add this to the total length - so you don't exceeded the internal piston space available.  Compare piston space vs. compressed tune assembly space - I usually leave about 1/16" extra piston space - to be safe.

Also, over lubing tends to be the norm, you don't need much to get the job done.

Many other tweaks, but these are the basics ...............

[Mark 611]

I'm with you, my friend! for the new folks pay attention!

[c_m_shooter]

I have put 2 Tinbum basic kits in HW50's with the OEM spring.   Neither had room for the extra power washers.  When taking it apart you do have to make sure that there is not a metal washer in the piston.  It can be stuck in grease in the bottom.   There is to room for both that and the nylon top hat.

[avator]

I don't have the gun nor have I ever used the TinBum kit but I do have a question...
Might the problem be that the spring guide and the top hat guide meet within the spring when trying to cock the gun not allowing the sear to catch? If so, could one or both of these guides be trimmed down shorter?
Am I barking up the wrong tree?  Has this already been mentioned?

[Yogi]

I don't have the gun nor have I ever used the TinBum kit but I do have a question...
Might the problem be that the spring guide and the top hat guide meet within the spring when trying to cock the gun not allowing the sear to catch? If so, could one or both of these guides be trimmed down shorter?
Am I barking up the wrong tree?  Has this already been mentioned?

Yes, it is possible.

-Y

[SpiralGroove]

I don't have the gun nor have I ever used the TinBum kit but I do have a question...
Might the problem be that the spring guide and the top hat guide meet within the spring when trying to cock the gun not allowing the sear to catch? If so, could one or both of these guides be trimmed down shorter?
Am I barking up the wrong tree?  Has this already been mentioned?

Yes Avator,
The spring guide + top-hat + washer = total length - cannot exceed the piston space or the piston will be stopped those parts irrespective of spring length.
Without including the spring, make sure the spring guide, top-hat and washer fit completely inside the piston.

I know this as I have made this mistake several times and had to shorten the spring guide (taking apart the gun again) .

Again, everything need to fit inside the piston space ............ or else .

[avator]

Ok, if that is in fact the case then those guides could be shortened enough to use the spacers to increase power if desired... correct?
Well, providing you don't go far enough to coil bind.

[SpiralGroove]

Ok, if that is in fact the case then those guides could be shortened enough to use the spacers to increase power if desired... correct?
Well, providing you don't go far enough to coil bind.

- Yes
- Yes

Both the spring and guide assembly need to be measured so that at full spring compression - everything fits inside the piston space.

[Robert 5mm]

I did a similar spring job on a Diana 460.
I added a SS Washer and Top Hat inside the piston end on the OEM spring.
It would not cock and I could not get the SS Washer and Top Hat out of the piston without doing a complete alcohol degrease.
So I reduced the length of the spring guide. The Top Hat and Spring Guide combined to be too long.

It cocked after assembly.

[avator]

well, I guess I did learn something from that case of 5 B1-2 guns I bought from the discount warehouse joint 10 or 12 years ago.   

[SpiralGroove]

Yes, this problem happens at least once ..... to anyone who does airgun tuning.

The only kits that likely work every time is an ARH kit ........ assuming you don't add additional spacers.
Jim has seen it all and makes stuff that works unless operator error comes into play .

[Yogi]

Somebody once mentioned a cool trick.  Take some 1/2 PVC tube and cut it down, just a little longer than your top hat lip, total spring compressed length and spring guide flange.  No try and inserting it in your gun in place of the spring and other stuff.  If the gun will not cock, sand some of the PVC pipe down and check again.  Rinse, repeat, till it just does cock.  That is your maximum distance of washers, TH, SG, and spring.  FWIW-I have yet to do it...

-Yogi

[SpiralGroove]

Somebody once mentioned a cool trick.  Take some 1/2 PVC tube and cut it down, just a little longer than your top hat lip, total spring compressed length and spring guide flange.  No try and inserting it in your gun in place of the spring and other stuff.  If the gun will not cock, sand some of the PVC pipe down and check again.  Rinse, repeat, till it just does cock.  That is your maximum distance of washers, TH, SG, and spring.  FWIW-I have yet to do it...

-Yogi

How about putting a ruler inside the piston and measure how many inches (or cm) of space there is?
Everything needs to total that length or less.
Pretty simple ......................

[Deerstalker]

AS SpiralGroove stated I installed an ARH kit with a Vortek seal & GPL-205 lube.  The 2018 year vintage HW95L had a damaged seal because of dieseling.  The ARH kit came with a top hat, spring & guide.  The factory setup had a thin SS washer, spring & guide but no top hat.  On installation of the ARH kit I put the thin SS washer in which fit in front of the top hat.  There was a steal liner which I also left in the piston.  After lubing with the GPL-205 the rifle is absolutely soundless when cocking until the piston latches in the trigger.  The chrono shows almost 17 FPE after about 9K shots using FTT 14.66 gr pellets and sometimes I can group MOA at 25 yards but not always.  I never had a problem with the ARH kit cocking.

[SpiralGroove]

Hey Deer,
Almost 17 FPE from a .22 caliber HW95 is very impressive ............. as long as the shot cycle is still good .
I think your receiver's compression chamber is very true - no air leaking around the seal - My HW80S is very much like that .

[scrinja]

I don't have the gun nor have I ever used the TinBum kit but I do have a question...
Might the problem be that the spring guide and the top hat guide meet within the spring when trying to cock the gun not allowing the sear to catch? If so, could one or both of these guides be trimmed down shorter?
Am I barking up the wrong tree?  Has this already been mentioned?

See reply post 15
I believe it is all explained also in the how the guides work and how to fit them Video did you not watch them ? 

[avator]

I don't have the gun nor have I ever used the TinBum kit but I do have a question...
Might the problem be that the spring guide and the top hat guide meet within the spring when trying to cock the gun not allowing the sear to catch? If so, could one or both of these guides be trimmed down shorter?
Am I barking up the wrong tree?  Has this already been mentioned?

See reply post 15
I believe it is all explained also in the how the guides work and how to fit them Video did you not watch them ? 

Nope, I didn't.

[scrinja]

Nope, I didn't.
[/quote]


Im the same with Instructions also lol