When I had about a dozen side mounted antennas I thought the cost of
thrust bearings would wind up costing about $1000 or more. My solution, at
least for the lighter beams was to use the PVC toilet flange cut for two
inches. I made a "sandwich" from two of them back to back connected by a very
short piece of PVC. The top plate was the "meat" of the sandwich.
Of course, the "thrust bearing" could not be tightened around the mast,
but that was not an issue since the mast was short and the beams were light.
I successfully used this setup for small tribanders and up to 6 element
10 meter beams for years at my old QTH. By the way, total cost was around
five bucks from your local Home Depot. The price probably has gone up but
it surely beats paying $140 for a Rohn t-bearing..especially for small
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