Problems with a "used" Golden Bee -- purchased from RC Groups

Purchased a good looking Golden Bee (original with #2 cylinder head) and metal backplate.
It looked like it was used very little. No screw/ screwdriver marks on the tank.
Still have a very "Yellow" anodized look to it.
It turned over, nothing was stuck, had a high compression glow head.
Looked at the screws in he back plate. Yes, the screw heads were buggered up, but for the age --ok?

Now, to take it apart to clean it up and rebuild it, cause it looked like it hasn't been apart for a while?
(this is where I should have started to photos of this teardown).

I tried to remove the screws. The wouldn't budge? O.K., I'll use some heat. I could smell the caster oil.
Ok, now try to remove the screws. The heads broke off.

Whom ever had this engine, used epoxy to help seal the holes around the screws.
The heads of these screws were not Cox engine type screws. Probably why epoxy was used?
(this is where the photos of this problem would have been useful)

Well the good part was with the heads of the screws broken off, I can just remove the tank.
The tank wasn't coming off, nor was it able to rotate?
Alright, maybe some more caster oil "goo" holding the tank onto the back plate?
I used heat again on the engine on the fuel tank. Started smelling that caster oil smell.
Using a pair of pliers on the backplate and a strap on the tank I was able to get them apart.
What I found amazed me. The previous owner used epoxy instead of the rubber gasket to seal the venturi tube to the backplate.
(this time I took the time to get the camera and take photos)




After about a 1/2 hour of work to carefully remove the epoxy from the venturi area. (not to create any burrs) I was able to remove all of the epoxy.



One thing I still had to address were the broken screws that were still sticking out of the crankcase.
Again using heat I was able to remove three of the four screws.
The 4th screw sheared off even with the crankcase.    

What I did was to carefully (using my Dremel)cut the screw even with the back of the crankcase.
Using my MiniMax drill/lathe, drilled out the broken shaft of the screw so I can re-tap it.
Then, re-tapping the hole I was able to save the crankcase housing.

Here are the finished photos of the rebuilt Cox 049 Golden Bee.