for this step you will need 2 of your screen door closers(air cylinders), scrap metal or bought brackets to mount the cylinders to the stands(see pictures), small nuts and bolts possibly comes with you screen door closers, 1/8" air line, drill and tap set,air compressor, air regulator, and air fixtures(see pictures).be sure to look at every picture, there should be a picture for just about every sentence in this step. The first thing you need to do is take the screw out of the back of the screen door closer, this is what holds the pressure so that it will close you screen door but by removing it, it allows you to apply air to push the rod now. you have to take that screw out , drill it out, and then tap the hole you have, this is best if you have a bench vice, put it tighly in the vice, pull the pushrod in the cylinder as hard as you can and put vice grips on it to hold the rod out, this will prevent you from drilling into the rod. Now drill out the hole and tap it to the size of the fixture shown in the picture, part A-22 at home depot, I believe it's in the plumbing section. Once you have it drilled and tapped blow the cylinder out to get as many of the metal scraps out as possible. Now see if the A-22 fixture screws in then take it out. Take the vice grips off and repeat for the second cylinder. Now that you've done that you can hook the 1/8" air line up to the cylinders, the cylinders will mount onto the wodden stands you built so cut an individual length of the air line for each cylinder long enough to meet in the middle between your wooden stands.Hook the line up by using the A-22 fixture and the other parts show in the picture. first put 1/8" air line through the A-22 fixture then put the air line through the white sleeve in the picture, and then push the gold rod thing into the air line. Now do this same thing for another stretch of air line for the other cylinder. To hook up to the cylinders simply push the airline into the hole you tapped and screw the fixture in. Now screw the brackets you bought or made onto the wodden stands wherever plausible and put a nut and bolt through the bracket and back of the cylinder to hold it to the stand. Now put a nut and bolt through the metal arm you welded earlier, do this by drilling a hole through the metal arm and putting a nut and bolt throught the end of the rod and through the hole in the metal. Put air to both just to see if they'll push but thats it, you'll have many fixtures in the next step for the noise being controlled by air and then you can run it all.