Joe,

Not a silly question at all - it is left hand thread so that the pulley tightens on the shaft when under load.

Chris


Shed troglodyte

2HP Kirby-Tecumseh Scott Bonnar 45 (14" cylinder)
2HP Briggs & Stratton Morrison 350BD (14" cylinder)
3HP Briggs & Stratton Rover (17" rotary)