I recently purchased a YHM rifle length diamond series forearm and the matching endcap. The endcap threads very loosely into the forearm. I supplied 2 drops of the included purple loctite to the endcap threads, assembled, and allowed time to dry and the endcap still turns freely. I unscrewed the endcap and applied 4 drops of blue loctite and repeased the same procedure and with minimal force (less than finger pressure)the endcap still turnes freely. Before I soak the threads 360 degrees in loctite and reassemble is there some step I am missing or something else that needs to be done?