The spanner is not required, but would make the job easier, the right tool, etc.... there's tons of info in the posts and the library about tuning these as well as other springers as Paul said. You'll also need a vise or a large buddy to hold on to the receiver while you try to muscle the cap off the first time. Also lots of info about cleaning the barrel properly and breaking them in.Good luck, ask questions, this is the right place for answers.Welcome to the family.pv