I took my housing apart on my Dyna to do something and when I got it back together, my throttle lock wouldn't work. Turns out there is a small piece the screw rests on that had gotten out of place. Got it where it needed to be and everything worked right again.

 

Thanks Shooter and Badlands,
I think I'll try that http://cruise-mate.com/Products_Harley.htm

 

@ vickers1,
I'll take a look at that, Thanks.