The manufacturer probably has a torque wrench setting (in foot-pounds or newtons) for the
wheel shaft lock nut. Borrow a torque wrench and tighten it properly, please. The "hand tight" thing is not acceptable for such a critical piece of equipment. I was at dock a couple of years ago and a 37' race boat was leaving their dock to head to winter storage. They took a turn and their
wheel came right off the shaft because the nut had been loose and they had used the
wheel a fair bit backing out of their slip. Despite hitting full reverse (remember, it's a race boat with a folding prop...not fast reaction time), they hit my port stern quarter at nearly 4 knots.
And people ask why I keep fore and aft springs on in fair weather...
Their stem bent up my stern rail, creased the fibreglass and sliced a cast aluminum extrusion clean in half. They were gentlemen about the cost, but it could be easily avoided.
Another sailor in the club this spring couldn't find the hub nut during launch. She had to steer by pressing the
wheel onto the shaft with her belly...probably not confidence-inspiring.
I have no idea why
wheel hub nuts aren't like the older type of spreader nut, with a hole through them and the shaft that
lines up and through which some sort of spring-loaded clevis pin can be pushed.
Other than that little rant, I agree with the "bungees are your friends" sentiment.