Many of us had to twist those tubes for proper alignment-no problem.
I agree, keeping a spare cap in the plane is a good idea. Once after refueling I took off without replacing one cap. Within 10-15 min. I noticed that tank fuel level going down much faster than the other. In a half hour flight I lost maybe 5 gallons out of that tank-not good. When I landed to refuel again I had no spare cap, but the FBO gave me some duct tape which sort of worked. I had to poke a small hole thru it to vent the tank and on the flight home the fuel loss thru that hole was much reduced but still was puking some fuel. When I got home the missing cap was laying in the grass near where I had refueled in the morning.