Online store for Canon Lens Replacement Parts?

[wedding photographer]

The pin inside the Shift Knob of my Canon Tilt Shift lens got lost...Is there a way I can find a store online which sells replacement parts for Canon cameras?
I have the knob I just need the pin to put it back...
I have looked at ebay, etc and so far I couldn't find any stores which sells small replacement parts for camera lenses.

Thanks for the help!

[95PGTTech]

Call Canon directly.