Found this link for practising the reaver mastermind puzzle. It's pretty good! Getting my time down to around a min and a half with usually 8 pulls of the lever. Once again, no need to use a puzzle solver if you practise enough. If you want to learn how to always solve this without a puzzle solver, I'll type out the method.

http://globalsoftware-inc.com/harncw/Reaver%20Trainer%20DDO/Reaver%20Trainer%20DDO.html

Edit: Just noticed that the timer is wonky in the practice tool, so actually managing it in around 30-40 seconds *dances*

Ya, I used that too at first, and the puzzle isn't too hard when you get the hang of it. However, now when I run Reaver's and I'm the designated puzzler, I still prefer to use a solver as it's quicker and I guess I'm lazy/ scared I'll mess up :s