Quote:
Originally Posted by Mike D
If the lenses haven't been removed in years the gaskets may be sticky. Don't force them. Re-install the thumb wheels a few threads and give the studs a gentle rap or two with a soft mallet.
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Instead of rapping, I would suggest gentle pressure on the thumb wheels allowing the lenses to slowly separate from the sticky seals. Sometimes it's necessary to insert a small pick between the lens and the seal to free a troublesome spot. Above all, take your time and do no harm.