ORIGINAL: Toad
Dont get me wrong guys, I am not offended that it took a different course. If I sounded rude, when I mentioned we had strayed, that was not intentional.
I wanted to see what mod's other folk do to their Norvels., compare notes, have some fun with it is all.
OK, here's one that is tough, but might give you 57 RPM . . .
In the case journal where the shaft runs: Mill away a few thousands of case material in between the front 3/16th" and the rear 3/16th". You have to leave the material in place around the venturi opening or all the case pressure will escape.
The shaft is then touching only the front and rear portions of the bearing area.
When the case wears out, install a bronze insert.