Frank,
I had two thoughts on your problem. The first has already been stated - the
use of penetrating oil such as "Liquid Wrench" or Kano Labs "Kroil".
However, if a thread lock substance such as "Loctite" was used I am not sure
if the penetrating oils will work. If the screws are anchored in metal (be
sure that the screw is actually screwed into metal and not just screwed
through a metal face into a plastic base) then you may try to heat them with
a small, clean soldering iron. This may be a completely STUPID idea for
lens work but heating a stuck fastener is a common method for larger work.
Greg & Polly
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