From the how-the-hell-did-we-miss-that-one department, last summer Milwaukee introduced an arbor that you twist to release the hole saw. Forget about un-chucking the arbor to change hole saws; no more knuckle-busting wrenches to loosen the jammed nut holding on the saw — just twist the base of the arbor and the hole saw pops free.
The system does have its limitations. It only works with hole saws up to 1-3/16″, which isn’t large for a hole saw. The arbors are available with 3/8″ or 7/16″ shanks and supposedly work with all hole saws, even non-Milwaukee ones.
To get you started, Milwaukee sells a kit with the arbor and a selection of hole saws. The kit includes 3/4″, 7/8″, 1″, 1-1/8″, and 1-1/2″ hole saws, a twist release arbor with pilot bit, an extra pilot bit, an adapter (maybe to use the 1-1/2″ bit?), and a 1/18″ hex key, all in a hard plastic case.
Pricing for the kit starts around $45 before shipping. You can buy the arbor by itself for about $15.