I just picked up a set of TS2 heads, 5-G.  I’m undertaking my first “build” and don’t have a lot of the tools.  Is there a standard BBTG for the TS2’s I can use so I don’t have to buy a club ruler?  (I’m hoping I can take my desired playing length, subtract the BBTG, to get the length shaft, after tipping, I will need. – Am I anywhere near the right way of going about this?)

Thanks!

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That would work, at least get you close.
Harbor Freight has 4 ft aluminum rulers for $4.99.