Hi there.
I just had a customer brought to me TT500 with pitch problem. Pitch tracks was dissolved due time wear or some chemicals.
So I was trying to find parts but as all you know original parts is out of stock. Then I replaced with some slider but with no luck.
And then I remembered that I have in stock technics SFDZ122N11-4 pitch that it 10k and 100mm travel. You can find them on ebay.
So.. It worked. It fits perfectly but you need to do some soldering and modify slider shaft.
Good afternoon. Does it work like the original pitch slider? Turn on the light when it is at zero? does it work when the percentage changes? In short, does it work the same as the original pitch? Separate Pin, have you deleted it? Could you send us more details about the call you made on the Technics Pitch slider ?