Since I'm a beginner,I was thinking about how to practice picking a lock in various configurations, i.e. bittings and security pins,without losing too much time in disassembling the lock,change pins,etc.
So I started reading some and I found this:
http://www.lockpicking101.com/viewtopic.php?f=10&t=18327
and ended up with the following tool.
All credit goes to JackNco for the original idea,I just collected infos from some posts and put them together
What you need:
A lock (DOH!)
5 metallic mainboard spacers or similar screws
a strip of metal (a street bristle is ok)
a vice
a hammer
Last time I bought a lock for practice (european lock ,since I'm from Italy) and I disassembled it,I found two spool pins inside, so after a couple of months I went out to get another one.
It was similar to the previous one but when I opened it found these looong pins inside:

So:

the spools were made following this thread:
http://www.lockpicking101.com/viewtopic.php?f=8&t=48900&start=0
I cut the lock in two for this project.
Now,puth the lock without the cylinder in the vice and use a metal rod (it was one of the rails for the lens and laser diode group of a CDRom reader) and a hammer to remove the caps on the top of the lock:

All 5 caps removed:

Now you have to file down two opposite sides of the spacers to allow them to stand side by side into the holes where the caps were:

Next,file down the "screw" part (sorry,I don't know how to call it) so it can hold the spring of the driver pin,but still can fit in the hole:

GREAT! We're almost done!
Now put the cylinder back in place,drop the driver pins (spool or whatever) in the holes and close the holes with the modified spacers:

(I wrote numbers on them to remember the order in which they fit with each other)
remember to replace the circlip.
To hold the spacers in place I took a piece of street bristle and curled it like this:

and used a piece of heat-shrink tubing for a better look.
The finished "product":

I used a rotary tool to make a groove on the front of the lock allowing the strip to grip and lock in place.
The repinning is as fast as removing the holding strip and “capsâ€, change the pins and replacing caps and strip.
If you find this useful and want to translate in “real†English, please feel free to do that!
Have fun,
Andrea