Window Winder Mechanism ??

[scoot]

Anybody out there got a spare drivers side window winder, lifter, mechanism ?? Mine's been slipping for a while, so whilst the car is in resto state I figured I should have a fiddle with it. The small gog that drives onto the half circle section has come loose in it's housing & therefore isn't gripping too well. It "might" repair, but if someone's got a spare complete unit kicking about, that would save me a lotta hassle !!