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Any builder worth their salt should be able to get those varmac seats off for you. They should either heat and twist off (not likely but if your lucky), or will need to be cut off. There are no guarantees that you wont do some damage to the blanks. I would use a hacksaw and cut around the seat in a spiral fashion a little at a time, its a bitch. Once you cut through the blank you use a flat screw driver to pry it up, and pliers to unravel it. If you do it like this you have good control and can fairly easily, but with some time, be able to keep the blade away from the blank. Could try a dremel but be very careful, eye protection, put it in a vice and cut in a staight line very shallow just enough to get through the seat, do two staight lines at 180 degree from each other, hopefully you could then fit a flat screwdriver in and pry the pieces apart.
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