I finally did this a couple of months ago, I don't know why I waited so long, very awesome! The thing that finally drove me to do it was that my smaller 2.17L tank would fill so fast at the end, that the burst disk would blow if I couldn't close the tank valve quick enough and open the purge. Now, at the end, I just open the purge when I reach pressure, then I shut the tank at my leisure, nice. Highly recommend.
Funny story. Showing a new guy, who is really scared of the pressures involved (smart), how to fill that small bottle, and at the end, I wasn't fast enough, and BAM! the burst disk blows. The first time that happens, anyone with a pulse jumps a little, someone already nervous, moreso. Say what you want about YH's, but they do fill fast, and they are loud. So between me screaming instructions over the noise of the YH, and hustling reaching for the shut down procedure and the burst disk going off all at the same time, it was actually a great lesson. I immediately laughed, and fixed the disk in about a minute, showing him that, in fact, it's no big deal, and telling him that now he knows what it sounds like and what will happen. LUCKY HIM, the first time I did that, I was by myself, didn't know what I was hearing or the severity of the situation, and I had never replaced one before, he had it easy!
