I don't know anyone breeding this cross ATM but I suggest it's worth contacting whippet racing clubs where they race Non ped whippets . They typically have a decent amount of greyhound in them. Most clubs are on FB
Only used it on one dig in the last few weeks. I can see why people put a bolt or pin through the centre to stop it unwinding. I dont use one myself though, just a slight twist technique every time you lift it back up cures that issue. Each to their own 👍 one i knocked up recently