I have one of the 70s versions, ply top and an alloy frame. Very useful piece of kit. Over the years I have managed to put a twist in the alloy frame probably due to overloading. Still use it but I wonder has anyone tried to take the twist out of one of these frames? I had thought of putting it in a vice and trying to straighten it but rather feared it might snap. Anyone any better idea?
I also need to drill out and rethread one of the bottom brackets on the frame as the twist has now allowed the retaining bolt to oval the thread in the bracket. I was thinking that the best solution might be to drill the bracket out and fit a mild steel bush threaded to the correct bolt size. As I have said before I am no engineer but a wood turner so any advice is gratefully received.
Allen