Things I liked:The valve tool provided made it simple to take apart the pump mechanism. I was able to repair my Sheridan C9 rifle and it is working once again. This kit was worth the money I spent! Things I would have changed:I would change the instructions. I had to go online to find better instructions that had step by step directions with pictures. What others should know:The most difficult part in installing this kit is taking out the pins on the rifle to remove the front part of the pump mechanism. It is very useful to have a good set of roll pinch puncih sets. If you haven't taken apart an old Sheridan rifle before then you will spend a couple of hours taking it apart and then putting back together. In the end it will be worth the time. I bought my Sheridan at a yard sale for $15.00 and then it worked only for a couple of days. I spent $30 plus shipping on this kit, a great deal to repair a popular American made rifle.