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Hi Bob,
Yah, $90 bucks EACH last time I checked, so that's $180 per column... and then the labor!!
I don't have the article you mentioned and I've yet to get around to seeing if the 1/4 or 3/8 inch diameter nylon spacers with center drilled hole would work as a long term substitute and then do a 337. The bearing underneath the rubber cap has an offset for adjustment and that might be a problem using the nylon spacers.
Maybe take the rubber cap that fell out to a hardware store stateside someplace or a specialty screw shop and see if there's something out there that would adapt itself.
I guess in the meantime maybe a single layer of black electrical tape or fiberglass filament tape applied tightly and overlapped will save the anodized black tube from getting scratched and scraped by the bare metal bearing???
SkyKing
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