I have the black and decker cordless drill mod vp840 type 2 dc. It uses 2 versapax batteries for 7.2.vdc, and it has a keyless chuck which I cannot figure out how to remove. I want to remove it and mount it on a portalign drill guide. My keyless chuck drill on a different drill I can remove by first removing the left handed thread screw in the the inside of the chuck, and holding the exposed motor shaft, (between the chuck and drill body), with a wrench. But I have no exposed shaft to on my BD Model vp840 to apply a wrench. Please advise.