Experimental Plastic Impact Sprinkler - New modification fix?

I have two of this model plastic impact sprinkler. The unmodified model is extremely fast. I original modification broke this sprinkler. I made a new modification that brought some of that level of brokenness to functionality again. The tip of the PJ arm has now a piece of black tape as you can see with a 1/8" lip at a 30 degree angle. So what you see in the operation is a function of that change. This particular model is better made than many of the other sprinklers that come out of China. I want to use a small spot of glue at the tip of the arm to see if I can bring back some of the performance that it once had. I also want to loosen up the spring some, but that is for another test.
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