To buy or make a coil winder?

[Radio Fixer]

I agree with Alan, having wound interface transformers with a total of 15,000 turns. No way would you want to do this with a hand winder. And you seem mostly interested in radios from the late 20's to early 30's and these are the most likely transformers to need a coil winder for. This is simply because the wire gauges used are very fine so 'green spotting' is much more likely to O/C the wire.

'Green spotting' maybe caused by electrolytic action according to some and is more common in anode windings than grids so I'm told.

Gary