When refitting, make sure that you tighten the bolts up, don’t assume that your dad/son has already done it. Not doing this leads to the comedy of almost losing a pair of wheels on the motorway with you wife/mum in the car
Back when my Dad was courting my Mum, in the early days, he ‘fixed’ her car for her. Imagine her surprise when taking said car out onto the local lanes, one of her wheels came bouncing past.
Fast forward a few years and my Dad ‘fixed’ up a bike he found at the tip for my birthday (I was 7 or 8). Imagine my surprise when, a minutes after taking it out on my local pavement, I pulled a wheelie and the front wheel went bouncing away down the road and I went teeth first into a lampost.
Fast forward another 20 years and I’m driving my Dad’s new purchase, a 30ft yacht plus trailer, down the M40 with him. Imagine my surprise when a wheel from the trailer goes bouncing past into the opposite carriageway.
FWIW my Dad is an engineer.