Rotating tower bearings

[Chris R. Burger]

I'm in the process of making a 40 m (130') rotating tower.  The 
rotating portion is being made of something similar to 45G.  I need 
to fabricate bearings for the slip rings to run on.  Some questions 
come to mind:

* Does anyone have suggestions about suitable bearings?  
* Are there rollers, made for some other purpose, that would fit the 
  bill?  
* Should the surface be rubberised, or be bare metal?  
* Should a bearing be supported on both ends of the axis, or is one 
  end sufficient?

Direct replies will be summarised on the Reflector.

Thanks

Chris R. Burger
ZS6EZ

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