Thanks guys.
I don't think drilling the key bit out is option as its probably hardened steel and its not perfectly flat.
The mole grips I have at the moment are good quality but they are the straight type so think I probably need curved ones.
Once I get them I'll chop an old bike type rubber up of something.
Bloody pain

Still have to check why my handbrake isn't working so well and make a failed jacking up attempt not look so bad for the MOT soon.