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@tooljoe, thanks for the suggestion but this is the stock chuck for the DCD950. @dewaltdude, I let the thread locker dry the first time I installed it for a few days. However at that time just applied a small amount on the base of the spindle where the chuck attaches. Used the drill only a handful of times before it fell off trying to extract a rather stubborn screw from concrete. Now that I've applied a rather liberal amount of thread locker red to the threads and it's dried for several days I may go back and see if I can get that screw out without it falling off again... What a headache!

I got this stuff at Discount auto parts.. Permatex Threadlocker Red. Wonder if it's just crappy. I put it on the last few threads closest to the inside of the threaded spindle the first time I installed the chuck. This time I put significantly more on the threads so I will see what happens. Bottom line it should never come off no matter how torqued a screw is in right?

Dewaltdude.. so I had applied loctite and installed the Rohm chuck on my DCD950 back when I asked a couple questions in this thread. Fast forward to yesterday at work, I'm using it to try to take out a 4 inch phillips head screw that is in a concrete wall. I put my drill on drill mode, highest clutch setting on gear 1. The screw didnt move, I stripped it a little bit and then after a quick second my chuck fell off! What am I doing wrong here? I just redid the installation last night and applied a very liberal amount of loctite this time. Used a hammer and wacked the allen key real good.

New here.. Needed to replace my chuck on the DCD950 and this video is invaluable. How much loctite do I use (on all threads, just at the bottom..), and should I get the red or blue loctite? Also, if I dont have a mallet when hitting the allen wrench, would a hammer be just as fine?