Okay, went out today and invested in a reasonably good quality replacement 10-inch Skil blade from Lowe's. Installed the blade and fired up the motor and I'm pretty sure there's still a problem. The whole tablesaw is stable enough, but missing is the characteristic "hiss" of the saw blade when it reaches its maximum RPM. I've always been surprised at this sound, since with the blade spinning and other than when you're actually engaged in cutting operations, the tablesaw is typically nearly silent - except for the slight sound of the motor and the "hiss" noise the blade emits.
Okay, well enough of this reminiscing, since we've now ascertained that there's something amiss with some component of either the motor or the driveshaft. I've already looked at exploded schematics of the motor/driveshaft assembly, and clearly that's designed with the idea of purchasing replacement parts and making repairs - and as the son of a mechanical engineer, I'm actually remarkably good at making repairs (something about the "nut doesn't fall far from the tree" I'll assume . . .). Any suggestions about a diagnostic course of action, since I'm not sure where to begin, nor what I'm even looking for that might represent something that's been damaged for that matter? I can assume those things will look like parts that are not "true" or damaged bearings - and fun stuff like that?