not just the Magnum cranks had the bolt, many K series did too before Magnums came out/
and as a side note, back before Kohler screwed up their corporate website, I went on their parts section ("many times") and at one time, I was looking at many of the cranks they listed, was doing a similar "build 1 good engine outta 2" thing, and believe it or not there are many Ks and Magnums that actually took the same part number of a crank as each other.
The nut or bolt flywheel retainer setup is NOT A "K series crank" vs a Magnum series crank" sort of thing..... I work on a lot more K's than Magnums and on most, I don't have to go "that" deep into to get running, it seems I see more K's with the bolt than I do with the big nut holding the flywheel in place.
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