I’ve cleaned up a lot of planes over the years and most of them come apart pretty easy. However once in a while I’ll get one that’s a bugger to take apart.
This Stanley No 5 I bought was pretty rusted when I picked it up. In fact the only reason I bought it was because the rosewood handles were in nice shape. I as took it apart, one of the bolts that holds the frog down was seized. I sprayed it with BP Blaster several times and tried numerous flat-headed screw drivers to loosen it with no luck.
I knew it was lost cause to save the bolt so I ended up drilling a 1/4″ hole through the top of the bolt and then use a 5/16″ drill bit to widen the hole.
Once the bolt was weakened, I used a cold chisel and a hammer to smack the head of the bolt off and then I was able to remove the frog.
The only part of the bolt that remained was the bottom half that was still screwed into the bed.
I gently unscrewed the threads with some channel lock pliers making sure the threads wouldn’t break off in the bed.
I have a lot of spare bolts from Stanley planes I have taken apart over the years so finding a suitable replacement was a breeze. Not the prettiest Stanley No 5 but with a coat of black japanning, it would look a lot better. Since the body of the plane is so rusty and pitted, the blade will need to be replaced since it too is pitted.