A rather nice little film showing a rolling and straightening machine made from Meccano.
I own a couple of sets of rollers, but the adjustment handle is rather more handy than the alan key screws I have to use. Pity this isn't robust enough for serious work!
My formative years involved technical Lego rather than Mecanno, but I never fail to be impressed with the ingenuity of builders working with Frank Hornby's "toy". Nor do members of the non-modelling public, the models always attract interest even from those far too young to have played with the stuff in the past.