Mixture Screw options

So there are a bunch of places that make Air / Fuel mixture knobs (so you can adjust by hand) for tons of different carbs. I cant seem to find anyone that sells one for the Grizzly 660.

Is there a reason? or am I just not looking in the right place. Its such a PIA to adjust the crabs on these things. Sure would be easier if I had a knob to twist to fine tune my Griz.


Thanks in advance for any help!