I'm restoring a Hobie 18 boom that uses custom machined "clamps" to mount the mast rotation cleat and outhaul cleat to the top of the boom. A 12-24 stainless machine screw goes through the cleat into the clamp below. Of course, when I tried to remove the 1989 screw, it broke off and now I have the rest of the screw seized in the clamp. Pictures are below. Does anyone have a trick for getting these out? The screw is sticking out .2" of the bottom. The clamps are $10 each and it takes four, so I'm willing to put some work into getting them out.
Top where screw broke off
Bottom with screw sticking out