Well, we're done with this one. Thanks Loren and Bill and Rick.
From your inputs I got not only a generic name-saw blade arbor bushing-but also the part number from Router Bit World, a company new to me. Googling the part number got me a number of sources, including Sears ($30.00 per). The rest were in the $13 range and RBW wanted only a buck to ship.
Order placed, and I thank you.
Followup note: Amazon showed two not very encouraging (at first) reviews: One said it was just punched out and not "finished." Hey, it's a washer! The other said it didn't fit. Maybe the saw blade was partly or completely responsible, but he didn't suggest that.
Backstory: Two SystiMatic Budke Blades, one new, one slightly used, wonderful product, no longer made, $5.00 (total) at a swap meet. Now I'm into them $17 each; they were over eighty bucks years ago.
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