Cruising along, 4th gear, 65mph, I hear a clanging below. Look down and my kick lever has rotated counterclockwise to the 6 o'clock position. Nursed it home in 4th(no fun!!). The kick lever works to start the bike , but I can only engage 4th gear.PLEASE tell me there is a common simple solution. 2 boys in college, They're KILLING me$$$$$$.