I will admit, that I found my one 'welded' retaining ring episode so 'traumatic', I've taken to asking about being able to remove lenses from lensboards, before all future purchases!
OK, so mine has not been glued. I am going to try with some WD-40.
The spanner I used was very similar to the one suggested by jim_jim. Once the blades are fit into the grooves of the filter ring, hold them tight to the ring with your fingers down close to the ring and then twist.
It worked for me but I was very careful not to damage anything if the blades of the spanner slipped out of the grooves. Not sure I would use WD-40.
... last time I had this problem I shipped the gear back to the seller because neither I nor my repair person could access the shutter to do a CLA ..
before manhandling the lens it might be worth deciding if it is worth damaging the shutter, board or glass ( if things go sideways ).. there's a lot of lenses out there to be bought that might not have this issue ..
that said, if the spanner wrench you purchased doesn't have mass / strength
to transfer your force, SK Grimes sells spanner wrenches that have heft to them, and transfer torque really well..
(as I did ) it might be worth taking the lens to a repair person who might have a bench lens vice .. or at least the right expertise, solvents / routine to do the job without damaging the lens...
I'm in a similar situation -- I think someone used some glue to keep a lens on a shutter. I can't get it to budge -- even with a pipe wrench. Take a real close look at the thread on the lens and see if you can spot any glue/goo. If that's the case it might be super-glue or epoxy. There are ways to loosen that. Also check for rust. Report back.
Can't you just unscrew the front and back lenses? That would prevent any glass damage.
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