[ironheadnitro]

How wide is the key on the back of an ABL crank sprocket/gear supposed to be? mine looks ok but feels a bit loose

 

[JIMMYJAMES]

Dont know exactly bud but a good place to start would be replace the sprocket and stretch bolt.. If its still got play its time to start thinking about replacing the crank (possibly fit tdi crank) or go for the tdi conversion. From experience, when they start wearing they only get worse and eventually you will need to get serious on it.