Thanks for all the replies. I'll have to figure out how to further loosen the front of the mount base before trying to turn the front scope mount. Don't want to force and damage something. The rear has a single mounting screw and the scope mount uses a kind of dove tail mount that gets clamped down by tightening a couple horizontal screws (same as the front sight in the ebay link I posted). I'll give an update when I get some time to tinker on the gone more, currently on the road. Thanks again!