On how to pop this dent out of my better bottle. Just took a dive off of the counter with a few gallons of PBW solution in it.
Jam a rag in the neck with an air gun hooked to a compressor. If that doesn't work maybe a large bung instead of the rag.
Maybe the end of a shovel or broom could work too.
Mine always seems to swell when I put really hot water in it and plug it up to shake it around for a rinse.
I'd try to knock it out with a long skinny object. Pressure alone will be too widely distributed to effect the dent itself.
Or, diet Coke, Mentos, and a potato
Haha, the broom handle worked pretty well seeing as I don't have an air compressor. I would have tried the diet coke, mentos and potatoe idea if I had read it sooner. Maybe next time.