I was thinking along those lines and thought someone could confirm. The rear 3pt lift arm is in the way looking on the inside of frame. I put my finger through the hole and can't feel anything on the inside like a nut was removed. Not sure why someone would do that unless the lift hit the cam and popped off the inside nut.
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'67 125
'72 149
'61 IH Cub LoBoy
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