Things I liked:The repair kit made my Benjamin Airgun, that is approximately 60 years old, shoot like new. Things I would have changed:The instructions are minimal. It would be helpful if they were more detailed and better print quality, instead of what appears to be a copy of a copy of a copy .... The instructions does not say anything about cleaning the air chamber before reassembling the parts, but it should caution you that it must be clean. What others should know:The first time I assembled the parts the gun would not pump up. I took it apart again and throughly cleaned the air chamber and reassembled it. I rolled a rag around a scrub brush to get the right diameter to clean the different size chambers. After doing that the gun pumps up great. It is important to spray some bore cleaner in the air chamber and then use a cleaning rod to clean it.