This is a great solution tofitting larger carburettors to tuned Vespas, you simply thread the cablethrough the centre, tighten the grub allen screwto secure and cut off the excess cable with a set of side cutters.
 
Suitable for most large frame Vespas:
GT 2°, GTR, Super 2°, TS, 150 GL 2°, Sprint 2°, V, Super 2°, Rally, P125X, P150X P200E, Lusso, T5, EFL, PX disc, MY, ​Cosa Etc.