So, to install just the reverse I guess?If you are saving the rubber and the glass, You pry the rubber gasket up from inside to get it off the lip of fiberglass and work your way around until it’s free. Probably need several plastic levers like you use for removing bicycle tires.
Unless the rubber is really new, I’d just cut it out and replace the rubber with a new one.
So, to install just the reverse I guess?
Yeah, the rubber feels like metal now after about 50 years.I would recommend just cutting the rubber and replacing it when you put the glass back in. Order through https://www.prp.com/