Morrisman
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- Location
- Staffordshire, England
I'd just tap it round with a dot punch and a small hammer.Not stupid, its not a tool you'd ever come across unless you're playing with lenses.
Yes, a little pin spanner.
Here's a picture of a cheap one from eBay;
View attachment 401895
Lots of lenses have the front element (and often more inside) held in with a threaded ring with two slots of holes to engage with a tool. It's usually a big thread (67mm on the lens I'm trying to fix) so it doesn't take a lot of loctite or corrosion to stick it really solidly in place.
