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Dual turntable lubrication and buzzing noise (audio example and pictures)

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Lads and Gentlemen,
I'd really appreciate your advice. So, I have a Dual CS 2235Q direct drive record player, which has EDS 910 motor, as shown in the pictures. So, I sometimes have louder and sometimes quieter problem with a buzzing noise, although buzzing sounds are always repeating per rotation, even if I unplug the turntable from the wall, and rotate the platter with a finger. You can hear it from the audio example. I'm not sure what would such a noise depend on, other than static electricity. But, when I first lubricated the spindle bearing, noise was gone. I used SAE 30 mineral oil, which is, apparently, not recommended. Unfortunately, a few days after that, the platter was making squeaky noises, and wasn't moving very freely. But I found out that if I hold the spindle and move it up and down the spindle shaft (not sure what is a better word for it), noise can become very quiet or gone. Also, if I touch the spindle while the platter is rotating, sound becomes even louder. And the other way around, if I touch the tone arm, buzzing sound becomes quieter. What could this mean? One person from Dual turntables repair and parts shop recommended oil shown on the picture, which took me by surprise, since the oil is mineral. Isn't synthetic oil a better option? People can't seem to agree about turntables lubrication, and, unfortunately, my record player's manual doesn't say anything about oils, just the other way around, that "the turntable should never be lubricated". Some people advise on using "sewing machine oil", but that one seems to be very thin. So, my concern is how will any type of oil be evenly distributed from the bottom to the top of the spindle in a shaft (since there is gravity in my country)? Do I need some type of grease, so it won't just fall to the bottom of the spindle? Also, there is a metal pin touching the spindle all the time (I drew a red arrow pointing at it). What is it for and should the spindle be lubricated where the pin is touching it?

Pictures: https://imgur.com/a/7U02f7K

Audio link (sorry if it's a little quiet): https://clyp.it/hderg11v
 
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that pin looks like a ground for the spindle. make sure it's clean and making good constant contact. don't over lubricate.
OK, thank you for your response. I also thought that. Although, before I lubricated the spindle, that pin touching the spindle, and also the spindle on that spot (where they're touching) was pretty clean, and then, I still got buzzing, like I do now, from that audio example. So, my concern is that I'll still have buzzing, even after cleaning them. Do you also suggest sewing machine oil?
Thanks
 
I use
Super Lube 51010 Oil on my SL-1200's, never had a problem.
Regarding the hum, is your ground wire connected to your phono preamp or receiver well? If so, remove the headshell, see if it stops. The pin for ground maybe dirty, reseat all connections. You may need to use a multimeter to check continuity from the spindle to tonearm, and actual ground wire. Hope that helps.
 
I use
Super Lube 51010 Oil on my SL-1200's, never had a problem.
Regarding the hum, is your ground wire connected to your phono preamp or receiver well? If so, remove the headshell, see if it stops. The pin for ground maybe dirty, reseat all connections. You may need to use a multimeter to check continuity from the spindle to tonearm, and actual ground wire. Hope that helps.
Thank you for your response. That lube seems great, unfortunately, I'm from one European country, so I can't buy it. But I noticed it says "Superior Adhesion", so does that mean that the lube won't fall to the bottom of the spindle shaft? Is that why you use it instead of sewing machine oil? Ground wire seems to be well connected to the both. I think I recorded that sound before I changed the cartridge, and with this new one, it still sounds the same. Before I installed it, I cleaned all of the cartridge contacts, headshell wires, and even the contact of the headshell with the tonearm with 96% alcohol. Could you explain me how do I check continuity, what mode do I set on the multimeter, and between which two parts?
Thank you in advance
 
Found it shipping from Belgium: https://bondis.com/en/super-lube-synthetic-oil-ptfe-7ml.html

Set your meter to ohms/resistance, if you have a button that shows a speaker symbol would be great. Touch leads together to test, should show less than an ohm and would beep if you have that feature. make sure all those points"ring out". Make sure the left and right pins don't ring out to the ground wire, If so, the tonearm wiring maybe shorted.
 
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