Unless it's sparking while drilling, no explosion...don't think it'll rip apart under pressure. But it is liquid propane...I'd burn up as much as possible before cutting into it. Of course I'm not adventurous enough to test this so...good luck.
Yeah...some folks thought I was crazy when I did it last time....but , just to be safe, I'm gonna use the drll press again....even though the chance of explosion is VERY low.
And...of course they're empty...or I'd use them to grill!
---------- Post added at 07:09 PM ---------- Previous post was at 06:52 PM ----------
okay and i thought everyone was picking on me because of HF wheels and foam filler. Looks like Poboy thinks like me. Maybe i read through all his posts to learn what not to do? Or how to make the wrong parts work?
I like the drill press saftey. i have some propane tanks laying around. gas tank for my next project maybe.

Just wondering what happened once the bit went through the tank? i dont think explosion if they are almost empty? Hacksaw should be good if its empty right? Or really small drill bit?
But...remember...I expected them to fail...just not get hurt in the process. I have a hand truck with semi pneumatic tires and one of them completely disintegrated on one side....I used foam and it got rid of the womp womp while rolling on the flat spot. What gave me the idea of using foam as a failsafe for the HF tires.
And...two things about the drill press....#1 it turns pretty slowly...reducing the chance of heat build-up...and #2, you don't have your hand right there should something weird happen....
It did exactly what I expected...just let a little pressure out of the nearly empty cylinder. I went ahead and let it air out for a day before I cut it on a chopsaw.
Hey....being a wild and crazy guy is fun....being a stupid one will get you hurt or killed.....
---------- Post added at 07:27 PM ---------- Previous post was at 07:09 PM ----------
I didn't plan on putting the first layer of foam in while the the tire was mounted, either....Why I blew one up in the oven....I was trying to stretch it out....(didn't know if that was gonna happen or not) so that...(off the rim) it would have enough circumference...
Oh...I still think what I planned had some merit....I just had to move on...BUT...the merit was how futile and a waste of time and money it is to use these wheels...
HOWEVER....They are still going to be on the build! ........grab some popcorn....