I have 2 Ryobi 18v li-ion drills with keyless chucks. When using a drill bit in metal, the keyless chucks dont hold the bit firmly enough. I read in the owners manual to open the chuck all the way and remove the screw inside and then chuck an allen wrench and sharply rap it counter-clockwise to remove the chuck. Well, guess what? I cant get the chuck to loosen. I have tried to use the motor and battery to hold against the rotation, that didnt work. Its right hand threaded, not left. I have a new Jacobs keyed chuck to replace it with, if I can get it off. Should I just try and find a keyed chuck with a hex shaft and chuck it in the stock chuck? Help.