My 1332LE is doing the same thing, however mine still holds at full throttle since the detent at full throttle still has tension. It however does not hold position at 3/4 throttle and less. I haven't pulled the cover to look at it yet but am guessing that it is a rivet with a spring washer. My thought is to take the lever assembly off and flatten the rivet a little tighter.
Does anyone else experience governor hunting and occasional backfiring?? Mine does, I think due to the fixed main jet having a burr, or just not drilled to the proper size. I think they run these things too lean probably due to government mandates. A little richer jetting I think would makeup the power that mine seems to lack................
Simplicity 990430 24" (vintage 1968)
Ariens ST1332LE 32"
