I just replaced my KT brake with a Primary Weapons Systems SM556. The threads are not deep enough on the SM556 to bottom out. Being that there is an orientation factor here, I have to use spacers to get the correct allignment and the spacers don't have anything to contact ...So, what I did was to put the nut that comes with the KT brake on first and tighten it down then I could use the spacers provided (from PWS)and get the correct (and tight) orientation that was needed. I did add a drop of blue loctite to the nut. I'm sure this is clear as mud but does anyone see a problem with this set up?