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One (1) brand new surface grinder balancing arbor. 3" per foot taper, ground all over, large end is about one inch.
It fits the hubs I sell, as well as Sopko ones. Those hubs are common on 510 612 618 818 grinders.
It is similar to the Sopko #52273, minus the nut. A gentle tap on a wooden block will develop enough friction on the taper.
You WILL need some kind of balancing stand. They are relatively easy to DIY, will be available soon at my store so please stay tuned.