Funny you should mention that. I was just playing witht he linkage tonight. The main idea is the motor would stop either fully up or fully down. By doing so if the motor malfunctioned it could not over rotate. If it did it would not hurt anything as it could move a full 360 degrees.
Second, with the motor stopping at apex a few degrees either way would not effect travel much.
Third I am going to alter the headlight bar lever arm to have a threaded rod where it to can be adjusted. Other wise the hole drilled has to be right on the money. And it will be easy to adjust travel as well as up and down limit.Here are a few photos of playing with it:
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