2015 runs smooth but the motor makes...I guess you'd call it a high frequency vibration? Anything over 7-8K makes the hands numb. I already have Throttlemeister heavy ends on my HeliBars. I do have manageable carpal tunnel though so might not be a problem after surgery. But for now I'm thinking of boring out the HeliBars to add some lead shot. Anyone done this before. Anyone think this is a bad idea or that it wouldn't work? Open to other suggestions to reduce vibes. The stock bars are hollow so I don't see how the HeliBars wouldn't be strong enough with a 1/2" hole in them.