Well crap, crap, and triple crap. I was routing edge splines in a Greene
and Greene breadboard top with a slot cutting bit in a PC 690 with a fixed
base. Een though I checked and checked to ensure the screw on the base was
tight the router slipped down once I started cutting the slot. Fortunately
it didn't go through the entire top. I need to patch the slot an try again.

Do the older style fixed base with a thumb screw have a tendency to work
lose and slip once routing starts? I had tightened it down as much as a
could without a mechnical aid.

Are the newer fixed bases better?