I wonder if a very small dab of fast curing JB weld on the end of a 1/4 or 3/8 inch rod (being careful not to let it run beyond the diameter of the rod), might bond well enough for you to turn the broken piece?
You could place a circular piece of foam rubber around the end of the rod and put the dab of epoxy on the rod end, so when you push it down onto the broken bolt, the foam will create a wall to keep the epoxy from running out and contacting the block threads. Just an idea. If the broken piece is slanted, then you could slant the bottom of the foam ring to match the contour.
This would have to done carefully, of course.
Last edited by Norcal Dave; 09/28/2017 6:48 PM.
