wondering how it went for barryjo. After reading his nearly two year old post and thread, I can empathize with his plight, but many have gone through the curve on the 3's. He might have been able get enough info and bravery to find repair scheme for his mid.
A replacement for the al tinsel wire with copper magnet wire was my start. The mids would click on a battery but only coming at the VC stub of wire, as the wires were a scrubby mess from previous repairs I think. Getting the wire lengths right took several shots in the dark due to the differing conductivity values of copper and aluminum, , but I got a good match on the one voice coil before doing the other one. OHMs only. Fixturing for centering the VC was done , but don't recall how I did it? Also, silicone or de-airated urethane epoxy today might be used to sub for the mids surrounds, I had no idea then or now what was used oem.. I used electrical grade silicone reduced a bit with acetone for mine. Still have the al wire in the tweets but ran low on gung-ho on rewinding them. The wires have been broken numerous times, and as there are small amounts of wire lost in each repair ,I have had to resort to field type repairs with thin copper strips crimped to the remaining stubs of magnet wire and flooding the joint with good solder. Not very engineered and not a job to be done after having a cup of coffee?but it worked.
I recapped the old crossovers and did the pots along with new stuffing and non oem grill cloths.
Listening to them right now from another room, but my hearing aid batteries are running low and chiming at me so anyway, I hope barryjo did get it sorted out. Let me go. herbay