Does This Impress You?

[Ian PParticipant @ianp]

Posted by Axel on 05/03/2012 14:51:31:

I'm trained in gunsmithing, when making fitted screws, or pins as they are called in the British gun trade, the slot is made last. the head is left too tall until its ready to be filed down. First the screw is tightend then a mark is made and the screw removed, a slot is made, and the screw refitted and filed. Most screws on shotguns are made thus, since no standard screws would fit the shape of the body of the gun.

Axel

Please could you elaborate what you mean about no standard screws being the right shape. Also when I searched I could find no reference to 'pins' (other than for firing purposes).

Ian P

[JonParticipant @jon]

Each screw is sized to the hole diameter, left proud and tightened up. A thinned down saw blade is used to cut the slot without marking the surrounding job.

As the screw is proud it will then be filed in soft or hardened state to the contour of the part the screw its fitted to. ie on a lock plate its flat but has to be level or fractionally left proud a couple of thou. On a trigger guard these are radiused if you like and have to be filed to the strap which attaches to the inletted woodwork. This is not a domed screw.

Most English still use BA by the way.

[Axel BentellParticipant @axelbentell]

Posted by Jon on 05/03/2012 22:11:11:

Each screw is sized to the hole diameter, left proud and tightened up. A thinned down saw blade is used to cut the slot without marking the surrounding job.

As the screw is proud it will then be filed in soft or hardened state to the contour of the part the screw its fitted to. ie on a lock plate its flat but has to be level or fractionally left proud a couple of thou. On a trigger guard these are radiused if you like and have to be filed to the strap which attaches to the inletted woodwork. This is not a domed screw.

Most English still use BA by the way.

Indeed, and even those that are domed or flat are often made so they line up. One must be careful not to over tighten them, its a sin that ruins the screw.

Many screws are left soft though, only if the gun has colour case hardening is it much of a prob.

A pin is a normal half threaded screw, and a screw-pin a full threaded screw, if I recall correct. I doubt one can find any info about this on the net though.

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