[TowerTalk] replacement top plate bearing

[Steve Maki]

Unless your vertical load is more that your rotator can handle, there is 
no advantage to a "thrust bearing" over a simple collar. The collar has 
the advantage that it can be split, and in most cases installed with no  
gymnastics involved; just a little ingenuity. Might need to drill a few 
new holes in your top plate.

-Steve K8LX

On 05/23/25 9:18 PM, John Keating wrote:
> I need to replace the rusted out bearing on the top plate of a tower. I see many flanged bearings listed by the usual online retail sources as well as direct from bearing manufacturers that are priced less than those with tower name brands. Are there any particularly critical design features - e.g., eccentric vs concentric vs standard set screw collar; iron vs aluminum flange; double vs triple seal? And at what point should one use a bearing that takes the vertical load in addition to lateral rotational force?
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