... whenever I drill into 1910's/1920's mudset bathroom tile for a hole for a
lead anchor.   The "masonry bit" chatters around like Ken when he has to take
a leak at a jobsite meeting, and when I finally get into the real stuff
behind it is such slow going that I begin to think of buying one of those
nail guns.

How do the pros do it without making a crater the size of a walnut?

Christopher "I Wanted to be an Engineer like my Father until I Flunked" Gray