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Thanks - found it. I can't think what kind of saw blade would touch
cast iron though. It's very brittle and I would have though it would
need to be ground out.
It takes a while :-), I thought there was something wrong with mine but
eventually, on a slow speed, it wore itself through. There's a pilot drill in the
arbor to keep it on line. It's still good & sharp too.
--
fred