Have you asked your self why is it so much of face? Is it wear and tear , lack of maintenance or the wrong cartridges being used? Is there an underlying problem you have not yet discovered such as a loose lump or badly fitting joint pin ? Best get these checked before you do any work .
I'd agree here. I've shimmed a few. Soldering the shim into place.
A .005/.006" shim at the very most is all I can recall ever using.
.002/.004" usually does it. That lets me refit it back on face with a little extra.
.012" off face to start with is a lot of room. Somethings up, or has been done to it already I'd think. Look it over closely