I had a similar problem on my sprint - except that when the part failed it jammed the steering wheel on a sharp 90 degree turn!! This really gets your attention. I wrenched the wheel and it came back followed by a shower of little plastic bits falling from the cowell.
The early sprint part was different I think but I just got used to flicking the indicator off with my finger - hope you have better luck.
Mind you I guess I was lucky not to crash into a tree!
the most common thing that happens to the 33 indicator cancelling mechanism, is the two little nylon pins on the back of the wheel boss snap off, the mechanism remains fine. If you remove the wheel, file down the snapped bits, drill two small holes and epoxy in some roll pins of the right size and length, you will never have the problem again.