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Zhumell 12" Dob Altitude Bearing Modification


I think you're worth a double serving of happiness!

Nicely done article with plenty of pictures, which I'm sure will be of benefit to many owners of similar DOBs. Thanks.

Ed D
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Hey Andrew,

Great idea! Can you help clarify a few things for me?

It sounds like the original setup (moving from outside-in) is washer, roller bearing, washer, then the clutch.

If I understand correctly, you're replacing the stock washers with homemade plastic ones. How does this work better? Is it just that they are thicker? I'm confused about the differences between the stock and modified parts.

And your final setup (again, from outside-in) is then: plastic washer, roller bearing, stock washer, clutch? Or did you replace the inner stock washer also?

Thanks for adding a little more detail for me. Great pictures, and a very simple solution!


Z10 dob, flocked

Orion ST-80


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Wanted to share with you that I completed your Altitude Bearing Modification this weekend. It works like a charm for all but my heaviest eyepieces. Your work is still paying off!


Primary Scope: Orion XX14IWith StarSeek and SS Pro Previous Scope: SW 10 Truss Dob on Z10 Base Eyepiece Collection: Meade 30mm and 24mm uwa 2" EP, ES 18mm and 4.7 82 degree EPs, and ES 9mm 100 degree EP 10X50 binocs with Monopod

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