The carbs are mostly BA, with a few (like the mixture nuts) that I
haven't been able to identify yet. Starter through-bolts are also BA,
don't remember what the connection stud is offhand, but it's not BSW.
BSW starts at 1/4" nominal diameter and goes up, so anything smaller
can't be BSW. The thread pitch is the same as UNC for sizes up to 1/2",
generally a NC nut will thread onto a BSW fastener (although the thread
form is different so th fit isn't right).
Randall
a Wallace wrote:
>
> Randall:
> On top of that, I don't know of _any_ BSW (the original Whitworth standard)
> fasteners on a TR3.
>
> Jim: Not on the SUs, or starter motor?
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