Joinery

The chisels on my hollow-chisel mortiser have dulled. Because the bevel is on the inside, I’m not sure how to sharpen them. Can you offer advice?

I learned my lesson the hard way: Mortises first, tenons second. But now that the mistake has been made, how can I salvage tenons that fit too loosely in a mortise?

I bought a bathroom vanity with dovetailed drawers, as shown below. Why do the drawer joints have such a wide pin at the top?

How can I cut dadoes with smooth, even bottoms using my tablesaw dado set? My set leaves ridges even though I just had it sharpened.

How can I store biscuits to prevent swelling caused by humidity?

How can I bore sockets into tapered segments so the stretchers will be parallel with the upper aprons?