Ok, i'll get one bought and give it a try.

Wish me luck!

be alreet lad, just take your time as said. bloody painters.

I bought some thread restorers the other day which don't cut, but are great for cleaning out crap like thread lock etc. Not sure how they would go with a powdercoat, but if you're worried about cutting material, might be worth seeing if you could borrow some these to try first

Just sorted it with a tap off of ebay.

i 'loosened' the powdercoat a little with nitromoors - the powder went rubbery- then used the tap and now the discs are all bolted up fine.

job done.

Thanks for the help and advice all.