So it works.... here is what I did:
check tire pressure before:
release all air from tire.
put penny in the bottom of the proflate 16
and grab the 12 gram cartridge
Then tighten up the inflator so everything is nice and sealed and ready to use. Put it on the valve stem and inflate. Then check air pressure.
empty inflator and look at bent penny
In short, it works, I popped the penny in there and tightened everything up and the penny actually got bent into the shape of the co2 cartridge. I accidently fired some of the air from it before I put it on the valve stem so it should get you about 30-32psi in the tire.
I then took another cartridge to top off both my tires since they were both below 30 and one cartridge brought both tires from 30-45 with no trouble and a little extra to spare.