hit a snag, crd pump removal

[mudski]

When you say hex do you mean allan key or normal nut? They're both hexagonal. I'm aware of the biting sockets for normal nuts. I tried using a torx T40 which fitted the bolt I removed well but it just spun on the damaged one.

Hexagonal.

https://www.kincrome.com.au/lokon-set-1-4-24p-met-imp

Worked surprisingly well.