Where the fff did this come from?

[humbucker88]

Looks like the dowel that sits on the screw on the clamps that go on the carb to head rubbers....did that make any sense?

http://www.yamahamotorcyclespares.co.uk/...take?uid=0

Item number 6, a dowel sits on the screw (presumably to prevent overclamping) they're very easily to lose but not really nessecary...