Maybe a mechanical engineer could answer this with confidence...<p>Since one of the stated purposes is to "rotate" (FIFO) the stock of cans, if you use the 18-inch tall plexiglass front, what's the risk of damaging the cans when dropping them down?<p>If there's even approx. 1/8 inch left-to-right wiggle room, it seems a can lid edge can strike the side of another can near its lid edge. Can this unseal? If so, how visible would it be?