Removal of stuck cores.
I purchased a lot of Navy padlocks from eBay, and with the help of some WD-40 I picked one to control and made a control key and operating key. I was able to operate/remove the core from a number of the locks, but some of them I couldn't operate or remove the core. What techniques do you know of to get the old cores out? Soaking in WD40 and bashing the lock with a mallet doesn't open all locks. I'm assuming that locks stamped with the same number are keyed alike. Even though the control key turns and the core comes out a bit, I can't get the sucker out of some of them,