Thanks guys. The Grainger and DIY Hifi bearings are totally unsuitable for what I have in mind. The bearing on LH is closer, I'll have to look into it. The Chinese stuff is quite comical.
Now that one I did not see when I searched. The ones I have seen were not impressive at all. I have emailed them to find out if they offer that bearing alone.
Nice ready-made track for an idler wheel on the underside of that eBay offering, but it would have to be one powerful motor to move that sucker. Does look to be beautifully made.
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