Why not back cut, Then send out to CRYO?
I used 300 below but that was years ago. I would send them every part but the rubber. Same price as 2 parts.

I have a Rockwell Test Machine in the shop, never got around to testing how much the CRYO helped each part. My guess, new never ran part, well used parts in both steel and aluminum would not see the same gain (CRYO same part new vs used). But nice bump the right way in both