After trying multiple ways of adding air assist using pipes and such, I decided to just get the LO air assist.
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Added the LO air assist
Your lens may not fitThe stock lens in my K40 did not fit in the LO air assist unit. Its diameter is to small. So I turned an metal adapter ring. Others have used a cut down nylon washer, which I think is a better idea.
I plan to change my lens and diameter later.
Enjoy and comment,