I bought a large benchtop drill at an auction a couple weeks ago. Today the
chuck fell off while I was using it. No harm done, but a bit of a shock.

I found the instructions on the internet; you just retract the jaws and
hammer it on with a soft hammer. I can do that, but if it fell off once...
Can you put anything on it (locktite?) to make it less likely to fall off
again?