I just use a chunk of scrap wood to hold the blade. I don't tighten it
very tight - just snug it up, but haven't had any problem at all with
the nut coming loose.
I have a big boxend wrench that I found someplace that just happens to
fit the nut and I keep the wrench on some pegboard I attached to the
sides of the table saw along with push sticks, 45/90 degree angle, and
other odds and ends.
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