Matt.
Brand new plastic knob for 1 euro or aluminium one for 20 odd euro.
Get the ally one mate,they work, properly.
I'd pay 120nzd for 2 of them,they're that good.
Hang on,I did pay 120nzd for 2.
I now have a spare part I'll probably never use.
Amazing the things you'll buy extras of,just...