Attemp at your own risk, I'm not responsible for any accidents, deaths, missing eyes or what ever. Sounds harsh I know, just covering my butt.
Pretty crappy drawing and pic, but it'll do.
Drive out the small roll pin closest to the breech end and the ejector should slide out. Works best if the ejector is popped out, as it would be after ejecting a shell. It's under less spring tension that way, less chance of losing the spring. It'll still be under some spring tension so be careful not to lose the spring if it flies out.
MOST of all, watch your eyes! Wear safety glasses if you have them.
I used a dremel tool with a cut-off wheel to do about 10 of them, works great. Take you time and get it as close to square as possible. Shouldn't take much over 10 minutes start to finish.
I don't visit the shotgun forum much, so thanks for the e-mail.
Thanks, Whitetailer for the heads up on my name change. ~~ raynor (sv)