Dayman- The only suggestion I can really offer on them is- be sure to check the inside mounting area where the scope meets the rail. I've handled a few of them where I found aluminum machining burs and trash in the nooks and crannies. This can be chased out with a small triangle or square needle file and a flat file. Just remove the nut, clamp, and tap out the steel screw and run a file over anything that looks or feels rough. Be sure to get it under decent light and look in corners and funky angles. Crud in there can sure leave you feeling flustered when you think you've got a good mount.
Rednecks... Keeping the woods critter-free since March 2, 1836. (TX Independence Day)
I'm going to use the words "clip" and "Long Colt" every chance I get. It grinds my gears to see new members attacked when we all know dang good and well what's being refered to.