Today I pick 4 of my rotation (three MK31 and one 32) Heljes of about same age in need of refreshment, and gave them 20 laps on 4 distinct natural stones (coticule/schwedenstein/novaculite translucent/China 12k). I'll just strop them before shaving, same technique for all 4.
I'll shave with them next wednesday/friday/sunday and thursday.
I'll post my impressions here. Let me see what happens.