you guys it is possible to re pin a lock but first if you have no key then you have to pick it when you have accomplished this you then by keeping the barrel turned you pull out the key cylinder. do this in a box otherwise you'll have pins and springs flying everywhere. which they will do. now you have to rebuild it. if you can come up with a key that fits the keyway ,, you then put yhe pins in the cylinder, if you cannot get the pins to run flush with the shearline then you have to file the longer ones down. never use pins that are to short as the top row of pins will always block the shear line. once you have done that you will need to make yourself a plug follower, this can be done by using a peice of dowling the same size or a little smaller than the diametre of the cylinder whole in the body of the lock. it needs to be about 4 inches long, then cut a small notch in one end of the dowling so that the round face end of it has a groove from top to bottom through it, all the way through the middle.
put the follower to the back of the lock and drop a spring in so the sping falls into the groove , then line the groove up with the back whole in the body, now push the spring in the whole, then drop the top pin in and push that in as well . use a small screw driver to do this. hold them both in with the screw driver then push the plug follower forward one notch to the number 4 pin or the 2nd from the back and do the same 1st spring then top pin then go to whole number 3 then number 2 then number1 until you have the follower all the way through the barrel of the lock. now you need a shim which is a very thin peice of metal about 2 inches long and 1/4 inch wide and very thin. you slide the shim between the top pins in the barrell and the dowling follower so that as you push the key cylinder back in you dont lose what you have accomplished.
hold the lock in one hand, follower and all. pick up the key cylinder and insert the cylinder slowly into the barrell, at the same time keeping the shimin place directly under the top pins" you must try to keep the shim in place"
slowly replace the follower with the key way cylinder, by pushing the follower out with it . remember the important thing is to keep your shim in place so that non of the top pins drop into the lower pin wholes. when you have replaced the whole of the plug follower( the dowling rod ) with the key cylinder you can the take out the shim allowing the top pins to drop into there bottom counerparts. when you insert the key it will push the bottom pins up to the shear line allowing the keyway to turn freely "walla"
i hope you have fun digesting this as it is a bit longwinded but pretty accurate if you ask me. if you want a lesson on picking josh the offers still there. i'll show you this as well as picking cylinders and the like . ive got picks you can use. remember " what goes around, comes around "
and thats a very true saying
good luck
jason

learning to be a locksmith is like an oblique curve it will never come full circle!!!