I bought the stock unit from a Canadian supplier.Seriously considering one of these.
Looks like you can choose different media to fill the head? Different size beads too, what have you settled on?
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I'm sure I could tweak little things, but you experienced what my stock unit does, even with no practice. I'm very happy with what I have.
If you pull the trigger, just make sure you have a backup bowl, since not being able to use a high end rig because of a $15 bowl sucks. It doesn't have to be an injector bowl. The injector fits 18mm connections, so a creative person has lots of options.