I’ve seen it suggested by several woodworkers that you can get by with a single mortise chisel, e.g., 1/4 or 5/16. I’m interested in building shaker style furniture, and there are many 1/2 mortises. Many tables have a 1 1/2 leg, so that would be a 1/2 mortise using the rule of one third. That seems so common to me that I’m confused why some suggest that you only need one chisel? Are they going over the mortise twice, as in one side with the 1/4 and then the other side? Or do you just cut an undersized mortise bc 1/4 is strong enough?