Originally Posted by RFOBD
So I'm just very carefully drilling a couple holes in the slanted metal part right next to the lens to allow a spanner or other wrench to grip that part and unscrew it?
Yes, and I would really use the term "dimples" rather than holes. It really did not take that much effort to unscrew it once I got a good grip on it.
There are some more detailed instructions on this out there on the web somewhere. Maybe somebody will chime in with the link.
I swear that the next time I need to take one of those apart, I will photograph the entire process, as others will need to do it.
Lately I've heard of people getting it out with a rubber stopper, by friction fit only.