I just eye-balled the available space for the new button at max open and subtracted a little for clearance. There is plenty of adjustment in the turnbuckle actuating rod to make up for any wear as time goes on.
I'm guessing it should last a long time since it's about 10x thicker than the stock button (for the non-brake PTO models), and the only time there is any wear is the short time between dis-engaging and the blades actually stopping.
Thanks for the supportive comments!
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