I have one Makita drill 10mm (3/*") Model 6406, which has one keyless chuck. I want to temporarily remove the chuck. There is no screw (I believe) inside the 3 jaw housing like other drill. The operation manual which came with the drill has nothing mentioned about it. Please advise me how to remove the keyless drill chuck? I do want to reuse the existing chuck as well. I want to mount the drill guide in between the chuck and the electrical housing to drill holes on a small ciruclar pipe. Thanks. John