I know it's a Cub so there are differences between them and the 113/123 motors on the A/B/C series. On them, the fan support is not a fork, but a channel, with a slot cut in the middle of it. The spindle moves up and down in the slot to get the tension right. The nut on the backside can be turned onto the spindle by hand to get it started, but eventually will bind on the sides of the channel, which is what you want, as that keeps the nut from turning while you turn the spindle down to tighten it into place. Awasher on the nut side wold just jam up the works. Is the Cub a similar setup? In any event, the washer serves as much as a spacer as anything and likely goes in front as lsarge escribes.
As far as tensioning, one wants to have one's belts in place, but it's sort of standard design that you ought to be able to start from the crank pulley and tension your belts one at at time, i.e., get the tension between the crank and fan pulleys right by tightening the fan spindle down where it needs to be. Once you've got that, then tension the generator belt by swinging it on its mounting bolts and tightening down the bolt that slides in the arm/brace. Just looking at the parts catalog, that would seem to do it, provided your belts are of the proper length. But I'm livin' and learnin' everyday, so if there's some difference, I'd be genuinely interested in hearin' about it. (Gotta get me wunna them Cubs one day . . .)
As far as needin' an octopus for an assistant, I've found elbows and prybars of sufficient length, and sometimes a block of wood to hold the prybar in the right place so as to free up both hands for wrenches, to be just the ticket.
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