With JB Weld... I also filled in the trenches in the crank case casting where the holes
through the upper flange to accommodate the 2 bolts holding the cylinder block in
place were bored deep and a little close to the edge so that when the builder
ground down the casting ridge, the holes were exposed.
No problem, now good as new... or better.
I also replaced the modern off the shelf bolts with more appropriate tall domed hex bolts.
Paul Debolt of Debolt machine is sending me four similar bolts sized 5-40 to replace the
screws holding on the side cover of the crank case.
