I Have a barrel loose 21 Winchester((0ff face)) That tightens right up with a .006 shim in the barrel hook. I was planing on using a .005 or .006 feeler gauge for the shim. Is their some other material that would work better??? The last one of these that I did was 30 + Yrs. ago. I used Brownells Acraglas to hold shim in place. I sold that gun a few years later and the shim was then still in place and working well. I am now a little old, and maybe behind the curve, so all suggestions and advice be appreciated. David
