Blackdog Posted November 5, 2012 Report Share Posted November 5, 2012 Hi, I have a Mcmillan M40A1 adjustable cheekpiece stock. Does anyone know the type of thread and size for the two thumb screws that secure the cheekpiece please? I would like to replace them with some flush fitting allen screws if possible. Thanks in advance Steve Link to comment Share on other sites More sharing options...
Gunsgobang88 Posted November 5, 2012 Report Share Posted November 5, 2012 Hi, I have a Mcmillan M40A1 adjustable cheekpiece stock. Does anyone know the type of thread and size for the two thumb screws that secure the cheekpiece please? I would like to replace them with some flush fitting allen screws if possible. Thanks in advance Steve Hi Steve, Being a U.S. product the thread size is almost certainly 10-32 UNF (nominal .190" diameter by 32 TPI). If these are not available try 3/16" B.S.F (.1875" diameter by 32 TPI), hope this helps, Alan Link to comment Share on other sites More sharing options...
Blackdog Posted November 5, 2012 Author Report Share Posted November 5, 2012 Hi Alan, Thanks very much I did wonder if a BSF would fit but didnt want to bugger them, will get my brother on the case as he is a toolmaker. Kind regards Steve Link to comment Share on other sites More sharing options...
Blackdog Posted November 11, 2012 Author Report Share Posted November 11, 2012 Hi Alan, Thanks again for the top advice. I managed to get 10 grubscrews on e-bay for £3. 3/16" BSF fit perfectly. Regards Steve Link to comment Share on other sites More sharing options...
Gunsgobang88 Posted November 11, 2012 Report Share Posted November 11, 2012 Hi Alan, Thanks again for the top advice. I managed to get 10 grubscrews on e-bay for £3. 3/16" BSF fit perfectly. Regards Steve No probs. Alan Link to comment Share on other sites More sharing options...
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