Thanks Guys, I saw that Lee Bros are a distributor of a manufacturing mob in Moorebank. I've purchased from them many, many, many years ago (when I was a proper engineer), but I thought that they had 3/4 closed... I'll check them out. Are they reasonably priced for individual bolts? A pack of 20 from Blackwoods is about $80... I would have purchased them, but I wasn't sure what I'd do with 18 spare 9" bolts 😜.