I was browsing through LP101 looking for tips on conquering Schlage, and I noticed that another user made the same mistake that I did of accidentally destroying a spring while repinning a Schlage, so I thought I'd give a quick tip/warning on how to avoid this.
This first happened to me when I was repinning a Schlage to two pins, and I managed to get a top pin and spring stuck in a lower plug hole. After lifting the spring to the shear line, I rotated the plug, and the spring got stuck in one of the blind holes drilled in the side of the plug (shown below).
Once a spring gets stuck in one of those holes, there's no way to get it out without breaking it unfortunately.
Basically, if you're repinning a Schlage lock and get a top pin/spring stuck in a lower hole, make sure to rotate the plug counterclockwise after lifting the spring to the shear line.