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These dimensions are taken from a new, (never fitted) Scott/Amal carburettor.

Needle dimensions

Diameter 0.105” 2,7mm
Overall length 2.930” 74,35mm
Needle tip to spring clip groove 1.095” 27,80mm
Spring clip groove width 0.025” 0,65mm
Groove depth 0.015” 0,04mm
Groove core 0.075” 1,8mm
Point length 0.185” 4,7mm
Point angle 30 degrees

The hole you mention has a twin on the other side, I just knew you
needed to know that!

Anyone know how to do colums on this site? Grrrrrrr!!!