In reply to Catriona:
They may have changed the crampons sufficiently over the years that you can't get anti-bots for them any more. I just made some for my G12s, because Grivel have changed them a lot and you can't buy purpose made ones any more. I used a milk jug and zip ties. Worked ok although some zip ties snapped first day out - rocky mixed so took a battering. I've replaced with some slightly bigger zip ties, to see if the last longer. https://flic.kr/p/24bcBNf