Take a look at this vendor "Scopestuff". THey have heard your (and others) cries. http://scopestuff.com/ss_l7sa.htm

In the case of my previous LXD75, repeated tightening and loosening destroyed the threads. I bought a Vixen mount after that. Vixen, whom Luigi has poignantly called, "a casting shop", yet in my mind, a damn good one.

I wish you luck my friend.