Rather than have a single bottle that might run out in the middle of your party, you could have two bottles connected together with one of our ‘changeover’ kits. If one bottle becomes empty, just switch over to the other bottle. The kit comes with it’s own regulator so you won’t need this one.
If you have only one bottle, install a gauge so you know how much gas you have left.
The regulator nut is larger than your typical adjustable spanner, so why not buy the right tool for the job.