Nothing like a challenge, eh?
I have a couple of European-made 8 string instruments ('dola, zouk) that have slotted headstocks (you know, like those pansified plastic string guitars have, but with 4 strings on a side rather than 3). The tuners that came on these are ok, but not great.
Does anyone have any idea where/how to get some tuners for these things? They would look like classical guitar tuners -- on a plage -- but with an extra tuner. Any help will be much appreciated.