The fishing line mod is rather simple.. Just take it and weave it around the needle wheel over and over and over and over.. It will create a web that chops the water about 200x better than before to create a more dense foam action.. The Gatevalve mod is easier to explain if I load a picture of it.. Keep in mind I dont have a great pic but you can see it somewhat..
The taller pipe on the left is for excess water to bleed off.. The gate valve in the middle is is for making very small adjustments to the water level inside the skimmer that also effects the water that is coming out (elbow on the far right turned down under water)
Just take the adjustment pipe out of the skimmer and pop that whole rig in that place and set to go.. I dont know the sizes off hand without pulling it all out and checking and I dont see myself doing that tonight..LOL