to not distort, use a bottom swage. You could square the bottom of a round pipe to fit over a twisted 3/4 or 1", sq. bar, put a collar on the solid sq. , for a stop...four legs would be better,....on second thought use a diamond twist below the pipe, ( still use a collar as a stop ).....another idea ....use four 3/8 or 1/2" sq.( equals 3/4 or 1" ) , form legs, collar the bottom, the weight of the top will determine the spread of the legs, twist it, collar above the twist, fit your pipe over the remaining straight pcs., 8"-10" should do it , then work your magic on the top....oh yeah, I've done a lot of pipe forging, 6" radius, no sand, no collapse, take your time,...uh oh...is there a secret there somewhere ?