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Looks like cocobolo not osage orange but that place looks great. Wish I could visit!
.8mm 60/40 Kester 44.
60/40 Kester 44 is great; if I was only doing guitar wiring, just pots and jacks, I'd probably go bigger like 1.5mm.
Kester 44 as well, but 63/37 works much better for me than 60/40, especially for wiring things like jacks and pots.