[Hallicrafters] SX-62A questions

[W5EI at cs.com]

After pulling a SX-62A from the clutches of an outdoor flea market operator, 
I've been frustrated at just getting the set apart for a much needed overhaul. 
 The cabinet seems to mate with the front of the radio OK, but apparently 
corrosion has fused the area where the edges contact one another.  I removed the 
three screws that hold the chassis to the bottom rear of the cabinet, but 
can't manage to pull the cabinet free.  Have applied WD-40 and another product, 
RIP 1 to try to penetrate the area's rusty edges.  Nothing doing.  Maybe I'm 
just missing something here.  I obtained a W7FG reproduction of the manual, but 
it sheds no light on disassembly of the radio. I've tried gently tapping with a 
rubber mallet around the edges of where the front and back of the cabinet 
mate to no avail.  Might a better penetrating oil work here?   

I thought I might be able to remove the knobs so as to allow the front part 
of the case to be pulled free, but some clever monkey rounded the Allen set 
screws that hold each and every one of the knobs onto the shafts.  Has anybody 
every successfully gotten these types of knobs free with an easy-out, etc?  Most 
of the rest of the radio looks like it is worth a try at bringing it back to 
life, so I hate to just give up on it.

TNX and 73,

Don McNallen
Troup, TX