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Daisy 880 Bolt Probe Magnet

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Ronno6:
i make replacement bolts for the old style 880 Daisy.
I make either with or without a magnet for shooting BB's.
The magnet version is way more popular.
I have had a few 880 owners break the magnet off the tip, which renders the bolt useless.....
I even broke one myself when I accidentally dropped a probe during assembly......
Are these magnets THAT fragile??
I believe them to be ceramic.

i have not seen this happen with the original plastic probe...
I remove the magnet from the donor new style bolt using heat to minimize the stress of removal with pliers.

I machine the end of the probe for the magnet to press-fit into the probe tip, with maybe a .001" - .002" interference fit.
Is this too tight?
I would consider that, if the magnet can withstand the stress of pressing it in, it should be OK...
Maybe I need to drill a larger hole and super glue the magnet in ???
Maybe I should make them like the old Crosman 760 bolt, with the magnet flush with the end of the probe.
That worked for the 760 even when shooting pellets, even tho the airflow to the pellet is restricted.

Looks like some product development is in order.....

Methuselah:
I thought I recalled the bolt is plastic and the probe a magnetized pin stuck (sometimes too far) into a hole in the end?

Ronno6:

--- Quote from: Methuselah on September 10, 2023, 04:28:33 PM ---I thought I recalled the bolt is plastic and the probe a magnetized pin stuck (sometimes too far) into a hole in the end?

--- End quote ---

You are correct.
That is the way I orient my bolt, except with brass probe and O-ring.
I do not ever recall seeing an original plastic probe with a broken magnet.....missing magnet, yes; broken magnet, no.

Actually the magnet should not hit anything during assembly, unless the assembler attempts to put the 880 together with the bolt
in any other position than retracted........

Ronno6:
The standard Daisy magnet is .092" dia IIRC.
I have a slew of 2mm ( .787" dia) magners that are way too fragile to be allowed to protrude from the probe tip.
But...........

I can reduce the OD of the probe to .125" or so and fully insert the 2mm magnet.......Should oughta work w/no real reduction
in airflow......... the ring space around the probe tip will be larger in area than the transfer port........

Ronno6:
I wish I could take better pictures, but you'll get the drift.
New variation: 2mm magnet, .123" dia probe at the tip, magnet fully inserted.

The area of the ring space between the bolt probe and the leade wall is more than 5X the area of the transfer port, so I don't see any restriction problems.

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