Tincanbandit, I would agree that is a Qualite/MK.
The missed on on EBay was a deal! @ $153 shipped.
As that seller mentions they are overcast in size, nothing a file & time won't fix and you end up with a near perfect fit.
FWIW; any only because I have my photobucket open and it's working today,
IF anybody wants to fiddle around with some brass parts. Here is some leftovers that I'm not going to fiddle with. Let's go with Hondo's $50 add $5 shipping or will trade for a set of #4 medium, blue or hawkeye matte, scope rings in good like new condition.
Here is a picture of how to build a Strut Mainspring retainer that might help.
Stolen picture, not mine.