- my replacement idler shaft from organdonorparts.com seems to be lost in transit
- on the other hand, I relubricated the idler bearing on my turntable, and this made it much quieter
- I installed an aftermarket cartridge sled from eBay and it completely solved my problems with connectivity
- but suddenly the main bearing started making really loud grinding noises. Argh!
Should I relubricate the main bearing? Is it possible to replace Renotac with some other adhesive oil, for example, chainsaw oil?
Sorry about your problems. I doubt that your main bearing suddenly became "un-lubricated" if it has been working well recently. Since you recently worked on the idler, make sure it is secured corrected with the O-ring keeper at the top seated correctly. Try re-seating the platter with respect to the idler wheel. Check for noise at all speeds. Try switching to 78 and then back to 33 rpm until the rubber of the wheel is where it wants to be. Make sure the selector mechanism is moving freely and is properly lubricated.
I do like chainsaw bar oil for the main bearing. I guess it can't hurt to lubricate it, but I agree with Tinkaroo that if there is any doubt about the main bearing, you should pull it and disassemble and clean it. This is MUCH easier to do when you are doing a cam service -- in fact, I'm not sure it is physically possible to get the bearing out without removing the cam and main bearing frame.
I like Stihl Bar Oil, which is clear (some bar oils are colored). (This is a popular brand in North America. I don't know what is available in Europe, sorry.) I put some in a cheap, non-medical syringe and use that to put a little between each "layer" of the bearing as I reassemble the parts. It does quiet down the bearing so significantly that my 1019s are indistinguishable in my normal listening practices from my belt-driven tables. It is a very satisfying service from an audiophile standpoint.