Fitting a Rekord trigger to non HW

[T 20]

BSA Airsporter & Mercury share the same cylinder threads as their prewar ancestors so breech blocks interchange. Think the Webley Mk3 is the same size.

I found that the Airsporter plug was the same pitch thread but a slightly smaller OD.

I'll go and double check as I have the cylinders of a BSA underlever and Webley MK3 to hand.




All the best Mick

[T 20]

I found that the Airsporter plug was the same pitch thread but a slightly smaller OD.

I'll go and double check as I have the cylinders of a BSA underlever and Webley MK3 to hand.

The Airsporter threads are definitely the same pitch but the plug is about 0.22 mm smaller in diameter than the pre War underlever threads.

The Airsporter back block wouldn't screw into the back block of my Webley MK3 cylinder as the threads didn't match --- the Webley threads being finer are probably some weird German thread form.




All the best Mick

[trajectory]

The Airsporter threads are definitely the same pitch but the plug is about 0.22 mm smaller in diameter than the pre War underlever threads.

The Airsporter back block wouldn't screw into the back block of my Webley MK3 cylinder as the threads didn't match --- the Webley threads being finer are probably some weird German thread form.




All the best Mick

That's helpful too, thanks

[look no hands]

I wonder how easy it would be to fit a CD/Rekord unit into a Mercury/Airsporter trigger block?

Pete

[T 20]

I wonder how easy it would be to fit a CD/Rekord unit into a Mercury/Airsporter trigger block?

Pete

I'm sure I've read of someone already doing that, Pete.

The biggest problem I can see is that the BSA latchrod is 5/16" in diameter and the Weihrauch's is @ 9.75mm.
The other problem (being serious) is does a Mercury or Airsporter warrant all the work to fit a decent trigger ?




All the best Mick

[look no hands]

I'm sure I've read of someone already doing that, Pete.

The biggest problem I can see is that the BSA latchrod is 5/16" in diameter and the Weihrauch's is @ 9.75mm.
The other problem (being serious) is does a Mercury or Airsporter warrant all the work to fit a decent trigger ?




All the best Mick

I totally agree with you Mick, I suppose if I had a well sorted highly customised Mercury, it might warrant such a conversion but I don't know what one would be like with nicely honed and fettled sears etc, I cleaned and polished up a Merc S trigger block once and done the same with the alloy trigger blade and it was surprising how nice and smooth just using the trigger was afterwards, I might have to experiment one day (when I get the time) and smooth out all the pivot points and polish up everything and see what that does.

Pete

[T 20]

I totally agree with you Mick, I suppose if I had a well sorted highly customised Mercury, it might warrant such a conversion but I don't know what one would be like with nicely honed and fettled sears etc, I cleaned and polished up a Merc S trigger block once and done the same with the alloy trigger blade and it was surprising how nice and smooth just using the trigger was afterwards, I might have to experiment one day (when I get the time) and smooth out all the pivot points and polish up everything and see what that does.

Pete

Hi Pete.

I took a long hard look at fitting a Rekord to a Mercury last night and came to the conclusion it was a none starter.
If you tried to fit the Rekord to the Mercury back block the top sear would have to poke out the top of the block and you'd also lose the ability to use the stock bolt.
If you tried to fit a Weihrauch back block you'd have to start with a 30mm bore one (35/77/80/97) build the block threads up with weld, and then turn it all down to the Mercury cylinder's OD.
Then you'd have to machine it to fit the Mercury cylinder plug, and you'd also lose the ability of using the stock bolt with this setup --- so it looks to be a bit of a none starter.




All the best Mick