I have an ancient 09M7 cox stockman that has stripped the drive socket (SKIT30 or SPR4098). I've got the old one off but I am not sure of the refitting process. There is a key to lock the new sprocket in but the only groove I can see is in the sprocket itself. Can anyone shed light on the fitting process please?
So I've answered my own question. I didn't realise that the key in the picture above had snapped in half- so the shaft looked like there was no slot. Hit it with a punch and now very clear where the key goes