Nelson Sprinkler flow reducer

All credit goes to the following. I am just tweaking their cool stuff to meet my needs.
by fpetrac
http://www.thingiverse.com/thing:1594349/
AdattatorePrestaShrader02.scad

based on Screw Thread Lib Michael Murray 2015
see https://micksworkshop.wordpress.com/3d-printing/screw-threads/
and
knurledFinishLib_v2.scad Written by aubenc @ Thingiverse
see http://www.thingiverse.com/thing:32122

I have chosen to ignore the Deprecated warnings till they actually quit working. They are functions that are called in each of the include statements.

The values here are for the snug connector. Change IMM to 35 to create the lose one. Or play with the numbers and create your own. My system for finding the numbers was guess and test...