List, well we've gone and broken the heads off both Gib keys on my buddies Metro. Note: to accomplish this we did the following. First, we stripped all paint from keys and crank, as well as the keyway itself, washed down the area with thinner, and dried. Second, soaked both keys for 4 days with Kroil, occasionally tapping the keys w/ a small hammer (about the same amount of force used to carefully center punch something) and adding more Kroil front and from crankcase side as well. We used a piece of 3/8 X 2 X 6 steel, split lengthwise diagonally as tapered wedges. Tapped the wedges together between the flywheel and the head of the Gib,with the wedge closest to the flywheel as the movable wedge. Tensioned the Gib for a couple of days, again with liberal feedings of Kroil. After 3 days of increasing pressure, the heads of course snapped off, with the failure point being at the base of the key head. Note that the face of the wedge against the head of the key was smooth, with carefully broken edge to clear the 90 deg intersection of head to shank of key. We have now made a drill guide and drilled the remnants of the keys to a depth about 3/16 past the center of the flywheel, carefully tapped 5/16-18, constructed a slide hammer using same threaded bar (B-7) and a slide weight of approx. 3-1/2 lbs. NO JOY!
we have considered packing the key area w/ dry ice to hopefully shrink the area some to reduce the grip, please help!

Paul