From: bretcahill@aol.com   
      
   The original torque arm was 11 mm between flat sides.  I've been using a 10 mm   
   open wrench to turn the axle which isn't all that mangled.   
      
   The axle was designed for a 10 mm torque arm.   
      
   The slack from the loose torque arm allows the motor to build up momentum   
   before it engages.  The impact destroys the torque arm.   
      
   Someone put the wrong torque arm on possibly a lot of GO Swissdrive ebikes.   
      
   In case you are wondering I'm a metrologist and measure stuff.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)