Ball Bearing Tightener, 1/2 X 1 1/4"
JD8522 is a ball bearing tightener, measuring ½ X 1 ¼ inches, used on 6/12 forage harvesters; 500 rod weeders. The parts book references I have are:
500 PC-501 Page 14 Key 30
ID = .512
OD = 1.260
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