Sota Comet Grounding question


I recently picked up a Sota Comet with a Jelco JA 250st tonearm for cheap because the arm needed rewiring. It was my first time rewiring, I used cardas wire and tags, and attached a ground wire inside the arm tube as well as one attached to the arm base. All the wiring connects to a terminal in the chassis, where the rca cables are soldered. The two ground wires connect to the grounding cable which runs to the lug on my preamp.

The question I have is regarding the ground lug that is at the bottom of the chassis. It looks to me like this lug connects to the motor. Where do I connect a ground wire from this to? I am getting an awful lot of static whenever I touch the platter which can be heard through the speakers, and occasionally when I touch the tonearm. There is no hum and everything sounds fine when a record is playing, but as far as I can tell the chassis is not grounded to anything which I’m hoping once this is done could solve the static issue. I tried running a ground wire from this chassis lug to the same lug on the preamp that the tonearm is grounded to which did not resolve the problem. 

Can anyone help me resolves this. I don’t get static from my Thorens or Rega tables, so I hope this is specific to the Sota turntable and can be easily fixed.

Great, thanks for that! I’ll give this a shot before I mess around with tonearm wires. Just curious if it make a difference if the wall outlet accepts two prongs versus three of I go this route? I have two different outlets near my rack and have both options.

sorry everyone for all the questions. Up til now I’ve just had to plug everything in and not think about all this.
The 3 prong outlet is grounded. The 2 prong outlet is not grounded.
Use the 3 prong outlet!
Wow, almost all my outlets are two prong in my old NYC apartment. Guess I should contact the landlord about that. I’ve had to use a power strip for the amp and preamp because I only have the one three prong outlet near my audio rack