Disclaimer: The following repair guide is provided for informational purposes. Not all these repairs have actually been tested here. iSoaker.com and its affiliates cannot and will not take any responsibility to any damages caused as a direct or indirect result of anything attempted. Use at your own risk/discretion.
I was tired of my CPS 4100s breaking on me, so just a little tweaking to the triggers, and the pump, and they worked beautifully. What I did and what I found:
I started by taking the pump off the gun. The plastic rod pulling the pump piece snapped on me, and the supporter one at the bottom was doing great. I then took one half of the pump plastic, and drilled a new hole over top the screw hole. I then took both pieces and put them together. I then put the drill bit through the first hole down straight, and drilled a second hole. I then inserted the Large Screw thing into the pump and through the hole in the white rod, and rescrewed the pump back on. I then tightened it with a nut and wrench. I tested it out, and it was hard to pull back and forth on the pump. So I decided the issue was that the screw was too large. I got a thinner one along with a thinner hex nut, and basically redid the above steps. I found that with a smaller than usual Screw, my pump time was decreased by 3-4 pumps, and I got the same pressure. It was also glided very easily. So if you have a soaker in your garage, don’t be afraid to attempt this repair, it will work on other blasters besides the Cps 2000.