As it is, I use the now-vertical-only tank as a last-ditch backup. It still stores securely but the difference is it’s only useable at anchor because it doesn’t work horizontally. I stand it up and connect it, finish cooking, then take the whole thing apart again. Admittedly, it’s a crappy solution, but it does avoid the desperate mayday call I’d be forced to make if I couldn’t make coffee in the morning. (“MAYDAY, MAYDAY, MAYDAY! Hello all stations, sailing vessel Justiina hailing mayday. Send hot coffee! Large! Black, no sugar! For my crew’s sake, YOU MUST HURRY! Helicopters are NOT inappropriate here…”) I also use it, lashed to the stern rail, for the barbeque instead of the disposable Coleman tanks (and I’ve completely given up on Coleman tanks even as backups; they’re always a rusty mess and potential bombs before I get around to using them.)
The vertical tank is not useless, it would just be a LOT better if it still worked horizontally.
I have the hose that hooks the barbecue to the LP tank instead of using Coleman tanks, and also the fitting that allows you to refill a Coleman tank. I really think most cruisers should have these 2 things aboard, just in case you run out of propane. You can (at least partially) refill a propane tank yourself, anywhere. That was my method before I found the 2 places that would refill my out-of-date, wrong-valve tank. Here’s how:
Hook the barbeque hose to a standard LP tank. Place it valve-down on a picnic table. Put the Colman-refill fitting in the empty tank and put it on the ground. Connect the barbeque hose to the Coleman fitting. Open both valves. Over an hour or so, LP will flow from the full tank down to the empty one. I’ll get maybe half a fill without any trouble but there is a “diminishing returns” process here: more gets increasingly difficult as the 2 tanks equalize their pressures. You can help the process by “burping” the lower tank (open the small pressure relief screw periodically.) You will also get a fuller fill if you chill the lower tank and heat the upper tank (heat the upper tank with, say, full sunlight, not with, say, a blowtorch – and if you actually had to be told that, perhaps this method isn’t for you.) You can monitor the progress with a spring-powered fish weighing scale. When you’ve had enough, close the valves and disassemble everything. Avoid any behavior that results in explosive fireballs.
LP-wise, I’m okay for now but, as I say, one day I’ll come up with a more elegant, but vastly more difficult, re-engineering of the whole LP storage system.