I've had three different sandwiches, two Inretech drop-ins, and three Opalec Newbeam led conversions, and have used the stock "twist to activate" switch on about half the modded MiniMags, and used Krolls on the other half. Never had a problem with twisting to turn, but over time, I've had to do some work on the Krolls for best results. I will frequently use both the Kroll and the stock switch to lock out the light so there is no chance of accidental activation. So far I haven't felt the need to epoxy the head to the body.
-Keith