I am no engineer but if I were then I would want one of those buttons to be more wearable than the other as there is a great deal of friction involved in stopping the pto. The one that wears down needs to be easily replaced so the logical one to make of fiber is the one on the outside rather than the one interconnected to various parts of the pto. Using metal for both will eventually wear the one connected to the pto and require removal of the pto to get that one out. If a bolt is found that is much softer than the steel one in the pto then it too should work.
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With my son, EricR Super 2084 with 54" mower, 451 blower. 2086 with 3 pt hitch, 54 inch deck, 551 blower, 54 in brinly blade. A 4 digit original w deck. A 70 with deck. 2 102s both with 42 in decks, one with creeper, 1 36 inch IH snow thrower CW36, 1 42 inch IH blade. 149 with mower. 2072 w 3 pt hitch, Johnny bucket, 60 in mower, 451 blower. Jacobson GT 10 with mower. DR Lawn vac tow behind,Home made lawn roller. Brinly cart, 2 off brand carts and 1 home made cart.
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