QDM
Your question reminds me of an incident years ago when a friend and I flew the Atlantic in a fixed-wing.
He'd got hold of some used mil immersion suits and, when preparing our kit the night before the flight, gave me mine with a rubber band. Q: What's that for? A: One of the wrist seals is missing on yours.
Thankfully, the engine kept going all the way to Texas and we didn't have to test his improvisation in the North Atlantic!
