I'm having trouble freeing 2 case bolts in my '35 VLD cases. The last 2 are rusted tight. I've soaked with Kroil, used stacked washers and nut trying to pull or get the bolt sliding, heated the cases with a propane torch (sprayed with Kroil hoping the cooling effect would pull oil into the bolt holes), used a small drift pin to try punch the bolt . . . all with no luck freeing them. I may not be forceful enough; but, then again I don't want to bust the cases. Any suggestions would be greatly appreciated?