I had to go the emery cloth route, since putting it on the bars, rough side down, no more slippage. So far so good.

Bocifus

 

has anyone tried locktite on the bars, not the bolts, but on the bars under the clamps??

 

A half hour with a center punch and hammer should roll the metal up enough to give it some really good grip?

 

With 10+ inches of leverage and two hands even the girliest girls bike rider would be able to break blue locktite. Maybe the red (stud & bearing mount) would work.

 

so, how'd the bird turn out?

 

My bars have all the wires in them so i just took my time and drilled making sure not to hit them. pinned and no more problems. i tried all the fixes and this is the only one that worked

 

I rode through there a couple days later and it was laying beside the road. You know turkey vultures are a nasty animals when the other turkey vultures won't eat it.. nasty or ethical, I don't know. Thing was big too.. like turkey sized.

 

Ive use adremel to XXXXX where the knurls should be

 

I'm not sure that would work; the knurling does add texture for the clamp to grip to, but it's my understanding that the knurling process raises edges as it lowers others so the diameter is raised in places where it's knurled. A dremel would add texture but not raise any of the surface area.

So far the hammer and punch/chisel sounds like the best bet to me.

 

take a dremel tool with a cutting disc on it and create some shallow criss cross cuts on the bars for the clamps to grasp onto.