I just came in from the workshop in an unhappy state of mind. My good old Craftsman table saw, which I've had for 20 years seems to have developed a serious problem. The height adjustment wheel spins freely for several turns and then grabs, but it only allows the blade to move upwards. I looked under the table with a light and it appears the worm shaft (if that's the right term) is slipping back and forth in its bearing sleeve, so that when screwed up tight one way, you can see almost an inch of bearing sticking out of the sleeve, and when cranked the other way the bearing emerges on the other end. This just happened; so I haven't monkeyed with it at all, but can someone tell me if this is a big problem? I have to leave town for a couple of days in the morning, and I'll be worrying about this the whole time.
Thanks for any advice, encouragement, etc.