2020 update : JC Verdier La Platine

@ledoux1238  , I would recommend against sending the bearing housing to the factory! If it went missing in the mail, you have a big problem, especially when the new Verdier factory has not resume production after all this time. 

When you dismantle the TT, you will find the bearing housing is nothing special, the part that goes into the plinth is just a cylinder, so you just need to measure the diameter of the cylinder and let the factory know how big a hole they need to drill. 

The tie rods for the arm towers are also nothing special, just a long M10 (or M12, I can’t remember exactly) bolt, you can measure it. You just need to let the factory know to use the correct thread insert! 

About isolation feet, if you need the feet to be easily adjustable for levelling, you have very limited choices! I have looked at many audiophile footers and nearly all of them are nearly impossible to adjust levelling once you put it under a heavy TT. You have to find a way to lift the TT slightly, adjust the footer, and lower the TT back down, very troublesome for precise levelling! 

I am going to get the footers used under this TT :

https://www.woodsongaudio.com/plinths/garrard-301-single-arm-classic

The footer has holes on the side, so you can insert a metal rod to turn it relatively easily. The brand of the footer is Track Audio

Is this the Jasmine motor you are using? It is a DC motor instead of 3-phase AC motor like the SOTA ! 

http://www.jasmine-audio.com/cjxl/index_6.aspx?itemid=181

In a Past Life as a ID TT Owner, I had a 9 Stone in weight Granite Plinth.

Granite of a substantial weight not necessarily at 9 Stone is a 'young man's sport', managing it as a material, requires quite careful considerations.

Today I still use Granite in Sub Plinth Designs as a Tier in a assembly of materials, but this is static in the selected position and is not intended to be worked with. The design that is in use for my Power Amp's has a Granite piece in use that weighs approx' 56 Stone. 

For the TT, when tinkering with adjustable feet, the devices shown in the Link will do a good job of taking weight and making the working with the Footers more simplified. The method extends favourably to all TT's with feet that are adjustable.

For the actual Footer used, the Audio Technica AT 616 might prove to be ideal.

https://www.amazon.co.uk/Mounting-Cushion-Lifters-Pneumatic-Installation/dp/B0DRNP2MG4?ref=pd_sl_95bd26f8710d400cad219f96d9d90a6e_e&hvcampaign=116739&hvadtype=1&hvdev=desktop&appid=1014&l=1&tag=uktextadsdes-21

In the world of TT's Supporting Structures such as a Plinth/ Plinth Chassis, changes have occurred in how a TT is designed. Designs are now in place that are no longer recognising Mass only as being of value. Especially when a Mass Material is with very poor intrinsic properties relating to a Damping Factor and Dissipation.

@thekong 

I found Track audio through a local dealer. Yes, these footers very nice though I could not find their load capacity?

And thanks for the pointers for not sending items.  I guess with all your input, I am running out of excuses for not doing a new granite plinth!!
 

And yes, the Jasmine motor is DC, my bad. 
 

@pindac 

Those air bags are great! And the AT 616 footers are nice as well..up to 60kg of load capacity!

AT 616 are today in Japan found at a cost typically between £30 - £50 

I have imported quite a batch over a period of Years.

https://www.fromjapan.co.jp/japan/en/auction/yahoo/input/v1213577180/ 

The Air Bags are also great, and also lend themselves quite nicely, if one wants to create a cheap trial into deciding if Suspension Support is to create something worth pursuing further. If a individual is willing to periodically give the Bag a few puffs of air, these might prove themselves to be worthy of being a permanent footer, offering a large percentage of the performance of what much more expensive alternatives can produce. 

 @ledoux1238 , for use under the TT, I will be using this version with delrin insert and short spikes. By looking at their construction, I don’t think you have to worry about their weight capacity, I believe a set of 4 can handle a 100kg TT easily.

https://avantgardehongkong.com/products/turntable-isolator