drilled a hole through each "cap" and through the platform. Put a round head screw through the platform and the cap. Tighten with a lock washer and nut
So to follow up on results. If used immediately, the salt seems to shoot okay. If left sitting it will absorb moisture and become lodged in the cartridge. I substituted salt with sesame seeds and replaced the tissue paper with cotton to better effect. Also, don't tamp down too hard.
There's a little audio glitch in the beginning. Sorry. Tried several times and same result. Als0, used the xBox screen capture app but it doesn't record pop up windows.
