Originally Posted by biteweasel
I was wondering about modding potential for these (rapides/splatmasters/GZ1000) and and wondered if it would be possible to remove the pierce pin from the valve and replace it with a hole drilled and tapped for an NPT thread. .
The valve was pot metal, but it was very common in the 80s to use aftermarket quick changers, or co2 tanks. Like the nelsons of the era, they used a dummy 12gram, with a passthru grip knob.
Something like that should be trivial to replicate.... though they do show up rarely. You never know