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Zhumell 12" Dob Altitude Bearing Modification

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#1 Olivier Biot

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Posted 27 July 2010 - 03:53 PM

Zhumell 12" Dobsonian Altitude Bearing Modification

#2 Ed D

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Posted 27 July 2010 - 06:12 PM

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

Ed D

#3 Tim L

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Posted 31 July 2010 - 03:06 PM

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!

#4 Dhellis59


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Posted 15 October 2012 - 04:22 PM


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!


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