Factory applied thread lock:
Kiron 80-200mm f/4 zoom
Kiron (Lester Dine) 105mm f/2.8 macro (I have two, both have thread lock in same places)
Super-Multi-Coated Takumar 50mm f/4 macro
On the other 105mm macro I had to readjust the range scale (not the one pictured). It also had thread lock applied to the same screws. Absolutely no extra resistance was encountered although it may have been worked on before but on examination of the screws this did not seem to be the case .
If the screws had thread lock originally and I had to remove the screws I'll reapply lock.
I resent the implication that I indiscriminately use thread lock or modify my equipment.