Got a bottle of 25/75 mix yesterday. Also picked-up a liner and tip. Had great fun installing the liner.

Finally got in there and fired-up the beast.
I ran out of time but was able to run a quick bead. Seems to be working much better now. Instead of the popping and stubbing, I get a smooth bacon frying sound and significantly more heat.

While re-wiring the main power connector, I discovered the 35 yr old insulation isn't looking real good. Looks like a new power wire will be needed soon, very soon...