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I don't know how to find a Thrust Bearing equivalent to the original on the Quick 540 outboard. Also, while I think about any 4mm Drive Dog could be used, what would be the same as the original?
I had a flexible shaft break at full speed and lost the prop, nut, drive dog, washer and main bearing (besides the bottom half of the shaft, of course) . I'm sure what happens is that, at high speed, there is sudden heavy drag on the prop that pulls it aft, extracting the partial shaft and everything attached.
Somebody ought to put together a 'Lost Everything' kit of these parts for the Quick 540. Ha