TROY-BILT electric chute joystick

[Timmie]

Good morning, (well here anyway @6 degrees)
I have a used troy-bilt storm 3090 that has a broken? joystick knob. I can't find any info as to how to repair this. Anyone able to offer an idea?
Thanks for now.

 

[mechanic mark]

Post model & serial numbers, thanks.