Ok, so I got an old 30's Iver Johnson motorbike frame. I had no idea that the two-piece cranksets were such a joy to try to locate. I see two options which I feel are within the scope of my abilities. I just want to see what experiences others may have had with these options: 1)cut out the crank hanger and replace it (i.e., weld in or splice) with a standard for one-piece cranks 2)harvest a hanger for a 3-piece crankset, which will fit inside the current hanger, tack weld it in, and run 3-piece cranks Obviosly the biggest factor in either of these options is that whatever hanger is placed in will have to be perfectly straight. With the second option, it has to be perfect the first time, because in order to avoid damage to the threads on the donor hanger, the welding will be done in an area where it would be difficult if not impossible to remove it to redo it if I screw it up. Either way it looks like I may be posting some project pics soon for this. I have a feeling I will go with the 2nd option, and I doubt that many people have done this one. Most people don't want to hack into a prewar frame too often.