Tuning springgun

[Robustgreen13]

Hey all! I have a question about honing the cylinder on a springer. Basically I want to know the process and the tools used. I've heard of a dowel and sandpaper or some kind of brake cylinder hone being used and just curious as to what the brake cylinder is actually called. Also is the point of honing just to smooth out the cylinder and thus the piston moves smoother or more consistently? What kind of lube do you use when putting it all back together also? Any help would be much appreciated dudes so thanks in advance.

[Kailua]

Honing or crosshatching a piston cylinder with 400 grit is to help hold the lube in the grooves.  Charliedatuna recommends Superlube with PTFE.
http://www.gatewaytoairguns.org/GTA/index.php?topic=26274.0

[Roadworthy]

Well, welcome to the GTA!!  Believe it or not, a brake cylinder hone is actually called a brake cylinder hone.  You get them in an auto parts supply store.  They come in a two stone version and a three stone version.  The three stone is what you want.

That said, you don't really need one.  You can cut a slot in a wood dowel or 1/2" PVC conduit.  With that tool you can do the same jab as the brake cylinder hone, just a bit more slowly.  I personally prefer to use wet or dry sandpaper.  I then rotate the dowel with sandpaper by hand as I move it in and out of the cylinder under water.  When done you want to rinse the tube really well to get the grit out.  You can follow with a cloth on your dowel to dry it.  I even finish with an alcohol rinse to remove residual water.  Lube lightly with the PTFE grease or even a good moly lube.  When finished, go back with a clean rag and wipe out the lube.  There will be enough residue in the grooves to do the job.

Smooth all rough edges on the cocking slot.  Inspect the seal.  If damaged, replace it.  On reassembly, many folks use a thin layer of plastic when sloding the piston back in to keep the seal from catching on the cocking slot.  While the gun's apart be sure to smooth any other rough edges and use moly on sliding surfaces.  More info will probably follow in other posts.  You can also research tuning in our library.  Feel free to ask questions.