If you want to start picking high security locks you will need to learn how spool pins work.
Spool pins look like roman columns – wide on the top and bottom. When you try to pick a lock with spool pins you run into something that is called “False Set”. What happens is it will feel like you have properly picked the lock and that it is starting to open when in fact to have moved the thinner part of the spool pin to what is called the sheer line. The first lock consists of three pins, two standard and one spool, The second lock contains of five pins 2 spool and three standard. The locks have been laser engrave to help you identify the number of pins and the location of the spool pins. If you are serious about lock picking you will need to work on spool pins