ya, I lost the chuck key to my grinder. I have tried vice grips and plyers on it to take out the old blade and install the new one but it didn't work. I use a grinder to sharpen my mower's blades. Is there any way to unlock this without the use of a chuck key? or is there an easier way to get my blades sharpened? I guess I could take them to someone but I'd like to do it myself.