Ok thanks guys.
Mine had been tight in the hole. A little sanding with some 220grit and a 1/2 inch dowel, and now it has freedom to move. And I think that I still have the contact at 10 and 2. I'll have to recheck that.
It had been a restored rifle (so the cap doesn't match anyhow), so if I fudged the correct fit I can get another from somewhere. I think tradex has them.