Okay, my father-in-law has an old grinder wheel assembly in his garage. The motor is separate from the wheels and runs it with a belt. I swear it's older then me and covered with gunk. I was using it today (possibly the first time it's been used this century) and it froze up on me. The motor spins, but the wheels won't. I can't even move them by hand. There are little porthole things with flip top lids that I thought were to put lube in, but my father-in-law says he's never done anything with them. Is this a case of just having to break it down and clean it? Any help would be great!