I believe it's supposed to have a clip in the groove the spring is hooked to now and the spring is supposed to be hooked into the groove towards the outer end of the stud.
I use the spring as a clip also, for two reasons.
A little less off angle wear on the carb throttle plate shaft bushings or bores, and less parts.
It works fine unless the spring drags against the shaft making it not slide well.
His lookes plenty clear of the shaft though.
