I've also heard them called Thumb Breakers from the good ol' days of manual steering.Added a simple suicide knob to my P1k5 today.
10 bucks at local farm ranch store.
Now I can steer and run my winch easier with my left hand, while shifting / turning blade with my right.
bolts in the pkg are just long enough to engage the nuts when fully tightened down.
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Do agree they have their uses. 👍