Greetings to all. I'm currently working on a Whizzer with a 51 Chicago Schwinn frame. It has an Arnold Schwinn front brake with a bad axle. I need to find an axle so I can reuse the race and bearings. This axle is 5 1/2" x 3/8" but the tpi is a mystery. I've tried a 3/8 x 24 tpi and a 3/8 x 26 tpi. Neither work. Both the axle and race are stamped (a s). The nearest match on a thread gauge is a 1 metric. I've read Schwinn manufactured some of their own with non standard specs. If you can help I would greatly appreciate it. Or if you know where I can buy one please let me know. Thanks in advance. ...Old Ed...