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I rebuilt a bar on an Allis Chalmers #3 mower. I took all the guards off, ground the head off the bottom of the rivets and drove them out from the bottom with a pin punch. On the AC, and I'm assuming the MF will be the same or very similar, the ledger plate has a beveled hole, and the rivets have a conical or beveled head. I set the ledger in, slipped the rivet in, held it in place while I turned the guard over, set the rivet head on a flat surface on my big vise, and peened the bottom over. The rivets are fairly soft, and a few taps with a ball-pein hammer will round it over nicely and tighten things up. MAKE SURE!!!! that the top of the rivet is flush with or slightly below the surface of the ledger plate, or the sickle sections will hang on it when the mower is running. That gets ugly pretty quick. BTW, I'm not at all sure I agree with the bolts/nuts on the sickle sections posted here. I'd think that reciprocating bar would shake 'em loose pretty quick, and I'd be worried about the nuts and tail-end of the bolts hanging up on the guards. Could be wrong, but I've never seen it done.
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