Spinner, it's a bloody good job you don't post on the UK Vintage Radio forum, as posting the above you'd be hauled over the coals BIG TIME as I was recently over my slightly cavalier attitude to different oil types! (I'm so embarrassed I haven't gone back!) Duals ain't BSR's or Garrards, that much I can guarantee and these Dual models have much closer tolerances (I have a collection of both Garrard and Dual marques here at home and have very closely examined and part stripped every one! Sure,a typical popular Garrard can be used with fine grease on the main bearing to take up some of the surplus slop, but Duals, even the cheaper ones, are a rather finer and closer toleranced thing entirely in the important parts and correct lubrication is mandatory for best and most reliable performance. If you don't accept what I say then fine, but I've had discussions with Dualcan Klaus privately about all this and I step in mainly now as he can't at present. Plexi has compared these lubricants with everything else not touched, so the grease he was using has obviously dragged things down a bit. reverting to something more like the manufacturers recommended has sorted this out with no need for further adjustment - and not all Duals have pitch tuning!
Plexi, I can't quote, but there's been much discussion in fairly recent times about all this. In Klaus's absence, I think I can summarise (others lurking here, please confirm!) by saying that the main bearing spindle ideally needs a more viscous oil than a straight engine oil as a more viscous oil is sticky and won't run away down the spindle with time. The platter bearing sleeves are oil retaining though, but I say the above for completeness.
The two thrust washers are positioned with the smaller inner diameter at the bottom and the larger one at the top. the platter hub 'locates' the top washer properly then. As per your pictures, the flat side of the race is underneath and the raised sections are facing top, so they hold the grease better I was told... If you mess up, replacement used race assemblies (complete with outer 'cage') can be got from organdonorparts as long as the part numbers match (I think they do mostly).
Dual recommended different lubes for different parts of the deck and yes, they used a different grease on the old 1019 than later 12** series models, so best to always clean off the old stuff before lightly applying later greases and oils. The 10-40 is fine for some underside pivot linkages, if the old greae is cleaned off, your superlube grease may well be ok, although Don here (Mrow2) supplies the proper stuff so why do differently just because you can?
This is where the SERVICE MANUAL comes in handy, as it'll show you where and what to apply. Dual used to make a service kit with the three oils and a small pot of Alvania grease. Shame it was discontinued decades ago. I still have a sealed phial of one of the oils but can't remember which it is
the renotac main bearing oil was red colour and has a lovely *smooth* texture in the fingers. The main bearing oil MUST be ok with sintered bearing sleeves and there's doubt over many modern gearbox oils for example as some have undesirable additives bad for bronze sintered types apparently.