Here are the main design criteria's.
1) Outside Diameter "OD" must be a close fit. This is the area that the machined Flowerpot head interfaces with and should be a close fit as possible without sticking.
2) Depth of Glass screen. In order to maintain consistency among FP customers we will strive to maintain 1/2" to the top of the screen. The glass screen should be able to handle fine grind needed for optimal vaporization.
3) Use only 14 & 18mm ground joints
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There is a drawing for the inspection gage below