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I went down the 10mm ball bearing rout today.Dodging clouds every 15 min!
I spent a few hours re building and adjusting the focuser that was .032" off center. I removed the slider blocks from inside the focuser and fabricated some thicker polythene units.
Removed all the grease and measured the eccsentricity with a dial indicator. All centered. put it all back together and recollimated it. The IF &OF fresnal rings look perfect.
The factory element alignment marks were off about 2 deg.
The spherical aberration seems very good.may be about .1RMS.
I will re test the spherical aberration with green light.
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