Threeper Luke reminds me of something I've been meaning to tell y'all for a while. He sends this link to Bassett Machine of Dripping Springs TX and their excellent M14 scope mount pictured above.
Luke calls it correctly:
Good M14 mount that's quick on-off, zero hold to within 1-1 1/2 MOA and won't shoot loose
Only mount I've found so far that won't give a wandering zero. If you take it off and put it back on, it will come back to within 1 MOA of zero, if you use the included strap wrench to torque it per the directions. Has only one screw to fiddle with, too!
I now have one of these on the China Doll and will test it next time I'm at the range.