Gentlemen; I have a 1/4" drill chuck, marked EMCO E6G, for my Unimat SL lathe that is locked-up open tight! I have tapped it pretty hard in all directions to possibly remove any chips, if that might be the problem. It is not rusty and I soaked it in kerosene and no luck. If there is a way to get it apart, I would like to do that too. Any ideas? Karl, CM