Murphy's friend Guru Joined: 04/10/2019 Location: AustraliaPosts: 669
Posted: 08:21am 13 Oct 2023
Another trick, which I use on my aluminium formers, is to make one end 0.5mm bigger than required. This makes the thing ever so slightly conical and, if you mark the smaller end and knock it out from this end, it'll just pop out after a few mm of knocking.