So a modeler looking to store planes vertical must decide which is less of the two evils, should a tank stopper fail and go unnoticed for a period of time. Hang it by the nose and let fuel, that very possibly leaked during flight, seep back toward the tail into maybe a servo, switch, receiver. Or let that fuel plus what is remaining in the tank after a de-fuel, soak the firewall?

There is no clear choice here, as no situation is ideal. Just trying to point out that hanging by the nose isn't a cure all in this situation. And in AA5BY's case, there is a probability that hanging the cub the tail limited damage by fuel, but we will never know.