Woodruff Key for Uncle Tom crankshaft SIP PERFORMANCE clutch

18x4x4 mm
steel, hardened
Product description
Strengthened woodruff-keys, enable the mounting of the SIP Performance ‘Uncle Tom’ crankshafts.
The clutch type found in vintage Vespa models is accurately mounted on the crank with the help of a woodruff key. Thomas Dolishka replaced these with stronger items while designing his crankshafts. These eases mounting and are more capable of withstanding the increased performance.
OEM numbers (for comparisons):
DIN 6885 A (DIN / ISO Norm)