After many wrong turns and mistaken ideas, I finally discovered a way to fix those sloppy Morse throttles. The culprit is worn out plastic bushings. (See the below photo). The solution is to tighten the bushings up by inserting a .005 inch brass shim behind them. And don’t waste your time fixing the shifter side, for slop there doesn’t really matter.
On the second throttle I fixed, I had a tough time getting the shim and plastic bushing onto the lower arm. The steel bushing, that’s pressed onto the pot metal shaft, had a ridge worn in it that had to be sanded and filed away.
One more thing: The shift detent, which causes the lever to stay where it’s put (F-N-R) has an allen screw adjustment. The trick to adjusting it is to LOOSEN the allen screw, not to tighten it. Try it both ways and you’ll see what I mean.
