I once saw instructions on a package of a new chuck. Lock the drill in a vice, open the chuck. It should have an Allen screw inside, behind the teeth of the chuck. Find the right wrench and tap with...
Depends on the chuck. Adjustable chucks can be loosened by hand, simply twist the end of the drill. Older (or heavy duty drills) need a key to open the drill chuck.
I have a McKeller cordless 18V...
Yes, they are generally based on Reuleaux triangle shape, which is mounted eccentrically so points on its contour track a square shape when rotated.
Another way to "drill" a square hole is with a...
Yes you can use a drill for glass, but glass/ceramic bit will need to be purchased at a local hardware or building center. Once the bit is purchased use the highest speed setting..