try checking w KAB, a major mod/repair house for SP 10s.
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If you register at Vinyl Engine you can download the service manual for the SP-10 Mk2, and hopefully for whichever model you have for the Obsidian plinth (they made three). Those should identify pitch and size for all screws, then it is only a trip to a good hardware store or on-line source.
And no, about the only thing for any SP-10 at KAB is the Technics bearing oil.
You might want to contact one of the plinth makers for the SP 10 as the SP 10 has to be bolted to their respective plinths (OMA,Albert Porter,Artisian Audio,Steve Dobbins).
Jonathan Weiss of OMA for sure knows because he ships all required hardware with his slate plinths. His email address is on the OMA website.