As it turns out, the original 1969 dated (69 13) International Rectifier GB256/PA full wave bridge rectifier block for my '69 Plexi rebuild is bad. I went to solder to it and the negative turret just FELL OUT. No fixing that! If any of you have a spare of the exact same type, (part number is on the side) please let me know. Yes, I could easily substitute any of many perfectly functional replacement full wave rectifier blocks, but if I can get the correct one I'll be happy to use it.