View single post by Greg Miller
 Posted: Sun Jun 16th, 2019 05:02 pm
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Greg Miller



Joined: Tue Feb 2nd, 2010
Location: Tarrytown, New York USA
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If you look carefully at the head of that pinch bolt, you'll see that it has two "flats" on the underside of the head. Those flats are supposed to key into the slot in the crank. When the bolt is slid over into the stationary position, the flats are allowed to turn in the larger round opening at that end of the slotted crank. When oscillating, the bolt will stay stationary and the arm will be free to rotate on one of the shoulders of the nut, rather than pivoting on the bolt. Letting that bolt drop into the slot will leave more clearance for the arm to rotate freely. Otherwise, the motion of the crank's rotation is constantly trying to loosen the nut.

Aside from that little detail, you have the stack together in the right order: the nut tightens the bolt in the slot and the hole in the arm remains free to rotate around the shouldered nut.