Hi bought 2 shackles (think that's  He name of them) and it then gave me an extra 2 inches which was plenty of extra room on the waist belt. 

Thanks everyone for the info. Cheers Deb

You might find it safer to wire up the bolt part of the shackle so it can't vibrate undone

Cheers

Hugh the 2nd

Thanks for that Hugh 👍Will do