G36 not firing full auto - fire selector cam - HELP

[Doodlebug]

The right hand fire selector cam/gear on my TM G36 has sheared at the tip, resulting in safe and semi only. It is a b*stard part to get hold of, no stock anywhere. My question is a) does anybody have a spare? And b) I'm playing cqb this weekend, is there anything I can bodge to temporarily stick it in full auto?

The cam stops a pin inside the gearbox from moving when in full auto, so with a piece missing and nothing holding it, it thinks it's in semi :-(

Assistance would be much appreciated!

Cheers

Dan