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@snakebrake
You have to keep the nut tight, Sooner or later they work loose. Loctite should stop it happening. However when mine worked itself loose. Very carefully filed out the rounded corners in the crank arm, kept the angles right. At this point the crank went way in too far towards the bearing. I then carefully cut a aluminium can so it made a collar to fit over the square spindle. It has to be good fit. Hammered the crank on with a soft hammer. Screwed the nut on with loctight and belted that too. Touch wood works a treat - but I check it weekly - don't like the crank arm dangling fom my leg when I'm cycling. An idea from Sheldon Brown.