bobk,
What I would do is soak the stock overnight in acetone, the acetone bath will remove the old finish, much of the oil staining and probably disolve the glued repair as well. Then I would take it out from the acetone, let it dry for a few days, then reglue with epoxy, wrapping the joint with latex surgical tubing or an old bicycle innertube to put pressure on it while the glue drys. Finally I would drill two thin holes down through the top of the stock inside the tang channel, spread epoxy down into the holes and finally screw two fine-threaded stainless steel bolts down the holes so that they interesect the former crack. However, before I installed the two bolts I'd measure how far I wanted them to go and then notch the shafts of the bolts with a file so that after I screwed them in place I could break them off just below the level of the wood in the tang channel.
That's just what I'd do, you can do as you see fit.
Steve
