Well, I've fixed the reel hub vibration. Adding a little grease instead of a drop of oil did the trick :-) Regarding the damper, I guess that I'll just simply leave it alone.

Thank you for the advice, I'll try to locate some suitable silicone grease and apply it to the tape reels. Can you recommend a particular brand of grease? By the way, can the oil damper on lid/cover be adjusted? Mine seems to jump up without being dampened. - Michael

Hello, The right reel hub on my Beocord 9000 hums/vibrates a bit when playing from the beginning of a tape. If you put your finger on it, the hum quiets down. Has anyone had the same problem? If possible, a solution to this humming?