Mcmaster.com part number 8784K945
6" length for $36 and about 45 seconds in a lathe. This is assuming ~2" diameter. Center drill on a lathe, turn down to ID of sleeve, fender washers and a bolt and nut. Simplest thing ever - hopefully you didn't pay too much initially. Its 95A duro, if you want harder than that you need nylon 6/6 or kevlar nylon - about $17 - $60 a foot in 2".
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