Sinclair speed screw for a Caldwell Rock BR slingshot base?

[BCR1]

The rear screw is threaded M10-1.5 and the speed screws are threaded either 3/8-16 or 1/2-20. Is it possible to re-thread the rear to either of those two sizes as a one piece rest is not in the cards, for me any way.

TIA,
Bill

Bill

 

[Mikemontminy]

When I had a Caldwell Rock I added a steel plate to the bottom for a wider footprint and also to add the speed screw.

 

[Dusty Stevens]

No problem to re-drill and tap

 

[BCR1]

After doing research, the dia. of the M10 screw is .393, so larger than the .375 of the 3/8 screw. Guess the 1/2-20 model is in my future.

Bill

 

[Curmudgeon]

I use the same rest with shade tree top. I put a lock nut above base like those on the front screws. I just use the rear screw like a speed screw. This rest is for military benchrest. I have a speed screw on a Greenlaw rest and once on target the small increment of elevation, once bags settle, seems to be enough. Maybe try before you click buy button. Anyway cheers happy shooting.

 

[Dusty Stevens]

After doing research, the dia. of the M10 screw is .393, so larger than the .375 of the 3/8 screw. Guess the 1/2-20 model is in my future.

Bill

I think if you just run a tap in there youll find it works fine. It has a lock nut on it and will never need to move anyway