JB, I can’t wait for your upright mod . The spacer your picture shows a beast compared to what’s installed in an s1 and s2 . Dave bean parts book has a good guide on rebuilding them. I will need to measure them for the 2 1/8 nominal call for .
What part did you sleeve on your upright? Are you using the same inner and outer bearings, seal and slinger?
Dakazman