The cocking piece can be fitted tight into the bolt sleeve which in turn has to be tight inside the bolt body. Plugs inserted in the bottom of the bolt sleeve can be filed down to take up the slack. Rigby's solution was a V shaped cut in the sear and a matching V point on the bottom of the cocking piece, this was sufficient for the Brits. All these and other tricks worked well enough for hunting rifles until they wore loose, but were no match in precision for the Lyman 48.