by deolslyfox » 26 Feb 2015 19:59
If you haven't worked with security pins, at least serrated and spools, you might not want to jump right into a "challenge" lock. EG: One full of serrated / spool and other security pins, that may have other "tricky stuff" such as counter milling, threading, extra heavy springs, etc, etc.
If you haven't been thru a Master 140 or 150, go there. When you can handle those easily then move up to something like a Master 911, then into the American 1100 / 5000 series.
For a cheap challenge look at the little Master lockout / tagout locks. I think they are 410 series and have 6 security pins. They are under $10 on Amazon.
Hope this is helpful.