The cancelling cam I have looks identical to all those available from the usual suspects, but it does not have the reach to actually catch and trip the the little levers that will cancel the signal. If my measurements are accurate, it needs an additional 1/2 inch of diameter before it would work. Am I missing something? Is there a trick to making these things work? Sure hope someone has run into and corrected this problem and can offer some suggestions. Thanks for any ideas.