Replaceable "shoes" on both the hook and the rear lump bite are the obvious fix for this. Except for Parker I have not seen such a feature on other SXSs. It should be doable as a retrofit on most SXSs and thus fix the problem once and for all.
I have done it on an experimental 3D prototype and it works. The advantage being that if you foul up on the fit, you simply change the "shoe" and start over, withouth harming anything. As for the "shoes", the one for the hook is easily turned from bar stock, basically it is a ring with a flange in the middle, cut in half, while the rear lump one can be milled in minutes. The slots in the lump to install the "shoes" can be cut with EDM thus avoiding the pitfalls of heat on a sensitive part. The "shoes" are held via cross pins in the lumps, not solder.
You can see the "shoes" on the 3D prototype here:
http://www.oplognosia.com/english/sideBySide.phpThe fifth photofrom the top.
