I recently bought a used 97B from 1998. I've seen some picktures that showed a bushing key or wrench to lock the barrel bushing. Am I mistaken or is it neccessary? I've been tightening the bushing with my fingers. It tightens to about 7 or 8 o"clock then I back it up to lock-up to the spring rod. Is this OK? I would think that turning it another complete turn might strip the threads.