Dave, I've taken two of these apart and had a similar experience to you. Even used most of the same methods as you (i.e. drill and tap). Mine eventually came apart after a few months of occasionally applying PB blaster. After I got mine apart, they were not even in very good shape. Rust holes in the channels, splits at the ends. If I had it to do over again I would just put out the $350 and order a new frame. I've heard the aftermarket frames may not fit real well though.


My toys:
'41 Chevy Model AL 3/4 Ton
'40 Chevy Model KD 3/4 Ton
Hinomoto 209N Tractor/Backhoe
Norwood LM2000 Sawmill
PJ 16' Trailer
and a Brand New Shop!
Be what you is, not what you ain't, 'cause when you is what you ain't, then you ain't what you is.