They need to be tight. Square has nothing to do with it really. I have 9 inch spaced primary tillage offsets one IH one JD both have round axles. I a Harbor Freight cheapy end wrench to bind against the frame on one end and 3/4 ratchet and 3 or 4 feet of pipe. Then I switch to a breaker bar and six or 7 feet of pipe for several more turns. And sometimes that will loosen up after a day bouncing over rock ledges, and need another round of tightening.
Of course taking it all apart and wire brushing blades and spacer faces, so no rust helps keep things tight too.
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