Probably been covered somewhere on here before but searching isn't helping me!

I got a 1995 1.8 carb cabrio and took the driveshafts off other day, the inner no probs held on with a c clip, but the outer,

can't see a clip or attaching method anywhere, read the haynes book and it says seek specialist vw advice!!! Well heres my plea!

Done alot of driveshafts before but never seen one like this, has a rubber/plastic coned washer with a slight notch in, thats it, not going to bash/press or pull it till I got a clue of what could be?
Herby