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OK folks, here's the deal. I went to an auction today and stole bought a Ryobi oscillating spindle sander (the Powermatic went way too high). Anyway, the sander came with a box of sanding tubes, one of the arbors for the Powermatic (boy, is the guy who outbid me gonna be ticked), and this inflatable/expandable arbor. I can't figure out for sure what piece of equipment you use it on. It is 6" long (or tall), the plate at the top is 4 1/4" across and it has an air valve at the end to expand it with. The other end has internal threads and they measure .922" or 23.49 MM. The best I can tell it is about 12 threads to an inch but don't hold me to that. It has that Grizzly paint look and there a bunch of Grizzly tools at this auction. So, what is it?
