I am having the same problem with my 2011 Proto Rail. I have tightened the set screw that is under the batter inside the grips and that did not fix it. I have not tried to remove the asa and tighten the two bolts under the asa. I will try that and see if it fixes my problem. I was just going to get an on/off asa and hoped the wiggley asa problem didn't affect that one too.