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@Dogtemple
I would get a reciprocating saw on that.
or get a bit of pipe and weld a lip to it and something at the other end to allow you to hit it upwards with a hammer.
slot it in under the 'shim' and whack the crap out of it.
it will work, I had to do something similar a couple weeks ago where the seat post was cut close to the frame. I cut it too close, by accident.