my dad and i made a picket twister from a gravely cultivater pto about 15yrs ago, it has a lathe head for clamping and a deadstop.you heat the bar stock up using rosebud and hand crank, works really well, makes really neat patterns going in forward then reverse and repeating.if you texture or fuller 1st then it really gets fun. any tool u can make can pattern the metal proir to twisting.any mark u make prior to twististing weakens the metal in that area.thats where practice and experimentation comes in .thanks, Gary