Ok so you have a throwaway schwinn and somebody wants the cranks. You cut them off and your left with a pretty good chunk of Schwinn. As you look at it you think....Gee I'm bored and I have the technoledgy to rebuild it better. You get out your old stretching machine and get started. Ok there is a box full of those 1 piece crank housings....Hummm.I could stick one of those in there and be back in business....Naw It needs about 6 1/2 inches of stretch...ahhhh. It needs one more cut at the top bar where it hooks into the seatpost tube.....Done. Line it up and tack weld it. Now the design of a straight top bar dosent lends itself to much of a design change. I have wanted one of those frames that has the bent bar under the straight one. This looks like its going someplace......get started welding and run out of wire....just need to put a new spool on but it killed my momentum....more later.