[watahyahknow]

a little trick thats been done by raceteams putting together racecars : use a silver (yellow red watever works on the colour bolt and is verry visible) marker and mark every nut and bolt after you tightened it for the last time , it makes it eazier to track down the loose bolts before it becomes a problem
making the line extent to the frame or other solid part allso shows if it moves or loosens itself.

that said i upgraded a frontwheel drive car to a bigger faster etc model once and "forgot" to tighten down the four big bolts of the subframe that held the engine and front suspension to the car itself.
i found them after i had the car on a propper lift doing the exaust but that couldve become a verry serious falure in a corner or during accelleration
i done the markerpen thing everytime since