FWIW, I have removed and replaced the platters from two different SP10s, a MkII and a Mk2A, in order to lubricate their bearings and in order to replace electrolytic caps in the electonic module. (In medical training the aphorism regarding procedures is "see one, do one, teach one".) I simply forgot about the flat area on the edge of the platter because it is not visible when the tt is put back together. However, as I recall, it is pretty narrow with no ridges to prevent a belt or tape from wandering off course. But if it works for you, that's all that counts.
I know all about the Kaneta modification, but he re-designed the electronics (as far as I can tell without being able to read any of the Japanese text), so his work is (probably) not relevant to the question of whether lengthening the leads will negatively affect function of the stock servo mechanism. Again, if it works for you, then I may be wrong to worry about it.
So I now finally get the picture that you use the stock chassis intact as a housing for the electronics that don't go into the plinth. Do you do anything cosmetically to cover the hole left by the motor/platter et al?
Thanks for the idea.
I know all about the Kaneta modification, but he re-designed the electronics (as far as I can tell without being able to read any of the Japanese text), so his work is (probably) not relevant to the question of whether lengthening the leads will negatively affect function of the stock servo mechanism. Again, if it works for you, then I may be wrong to worry about it.
So I now finally get the picture that you use the stock chassis intact as a housing for the electronics that don't go into the plinth. Do you do anything cosmetically to cover the hole left by the motor/platter et al?
Thanks for the idea.