Hi Guys --

Well, after spending WAY too much time arriving at the wrong solution, I am stuck.

My original pressure sprinkler was causing too much excess waterflow and as a result, I wanted to retrofit the top for a singular microtube for a dripper.

The three pictures below show the housing (1.5" or possibly more, per picture) as well as the contraption I attempted to make.

Needless to say, the addition is just slightly too big and the teeth don't grip. Going down in side doesn't appear to be the solution as then it is too small.

I'm stuck, any suggestions?