I'm pretty deep into a 1953 Schwinn Panther BMX Klunker build and I'm ordering the last of the parts that I need. I know this frame uses a 13/16" seat post, but I'm not clear on the seat post clamp size. Does anybody know offhand? I know 1" is likely too big, but I was hoping there is another option besides the standard AS seat post clamp. Thanks in advance for your help!