Bob, I use the Williams FP-AG-TK on mine and it works fine even without the mod for the pin stop. Just don't go overboard when tightening the two tiny Allen screws on the side. The heads will strip out if you do. The flathead screw on top can be tightened plenty and will keep the sight from moving.
I understand, Chris. I've been tempted may, many times to scope the 35E or even red dot it and I might even shoot it more if I did, but I bought specifically to be my iron sight gun. So far, I've been resisting the temptation.