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Dave Martindale

writes:

I think I will try the dremel grinding disc next since I have a dremel
(but no disc) if that does not work then I don't know what else I can
do. Minor details always kill my project schedule.

Note that Dremel sells at least 3 different types of cutoff discs. The
thinnest ones are about an inch in diameter and cut fast because they
cut a very narrow slot, but as others have noted they are very fragile.

But there is a thicker, larger-diameter style that has visible fiber
reinforcement on its faces that should be a lot more robust (but slower
because the slot is at least 2X as wide). There's also a quick-change
version of the thicker disc that mounts on a special mandrel. If I was
doing a lot of cutting with a Dremel, I'd get the quick-change discs.

In the past, I've cut through hardened concrete nails with a Dremel
disc. (But if there's room, I'd use a cutting disc in an angle grinder
instead - far more power available).

Dave