On Fri, 29 Sep 2017 12:18:42 -0400
"Jim Wilkins" wrote:

The Harbor Freight pin spanner is cheap enough to modify into a custom
tool:
https://www.harborfreight.com/adjust...nch-36554.html
-jsw

I've got one of those. It isn't very heavy duty. Works nice on 4.5 inch
angle grinders though...

I would try a large chisel, like a brick or stone masons. Turn it with
a large crescent wrench or vise grips. Might get a large washer to work
in that slot too with some grinding. Lots of choices, different ways
to attack that one.

I've thought about modifying a large crescent wrench for spanner jobs.
Drill a hole sideways through each jaw near their tips. Maybe 3/16 inch
to start with. Push some suitable pins in the holes and adjust the
wrench to fit your work. It probably wouldn't hurt the wrench, still
work okay. Haven't had anything quite that hard to remove yet...

--
Leon Fisk
Grand Rapids MI/Zone 5b
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