Technics 1200G - clamp record weight or no record weight?

@sleepwalker65 You're right, there is a difference between clamp and weight, but i have no idea how the chuck lock like this can pull up the spindle? When we apply a little force to lock the clamp arround the spindle there is no resistance coming from the vinyl, it's flexible material, it can not pull up the clamp locked arround the spindle, it's just vinyl that taking force on itself and that's how we're trying to flatten it on the platter. I've tried that Orsonic clamp on my Technics along with many other so called Disc Stabilizers (Weight) on various metal mats and i love it. 

Do you own Technics turntables ?   

@nkonor

... Think about things and use Your Ears. Do you really want a metal mat? Even if its copper. Some guys swear by VPI aluminum platters, Some Delrin platters. chakster likes copper mats

Absolutely. This is the only way to find out what is the best for our systems. But don't forget that Technics platter on GAE and SP-10R is made of brass metal. Brass is an alloy of Copper and Zinc.  

Micro Seiki platter mats (CU-180 and CU-500) are made of Gunmetal.

Gunmetal, also known as Red Brass in the United States, is a type of Bronce - and alloy of Copper, Tin, and Zinc. 

Top of the line Micro Seiki platters are made of gunmetal. Same about their Record Weight like the ST-10 and clamps like the ST-20. I think gunmetal is much more expensive than brass. 

I missed the point that OP has "G" model, but "GR" model does not have a brass platter (this is where technics cut the price) and adding a Micro Seiki CU-180 is reasonable. The cheaper alternative is SAEC SS-300 mat. As for the record weight the Micro ST-10 (gunmetal disc stabilizer is perfect for Technics SL1200G). 

Micro Seiki mat is not only a huge upgrade for powerfull direct drives, but it make any DD turntable looks like a luxury unit. I just love it on my PD-444 

I stand corrected; I was experimenting with the VPI weight.

@chakster 

Thank You for the clarification on the Micro Seiki platter mats and record weights. Much appreciated. Will investigate.

Dear @nkonor: Flat records makes a difference for the better that's why MS, Yamaha, Luxman and many other TT manufacturers came/comes with a vaccum record hold down mechanism.

Try to find out the after market the vintage Audio Technica  AT665BX or the AT666, these ones comes with vacuum hold down  mechanism and works really fine. You don't have to spend 2.850K Euros .

In the other side the best mats are not metal ones, normally metal goes against quality levels.
The Acrilic that you are using confirm it and the best to have is the original SOTA Supermat in combination with the reflex Basis Audio clamp that's better than the Sota reflex. Of course that exist other non-metal mats as other gentlemans shared here and even there are Technics owners that prefers no clamp.

Regards and enjoy the MUSIC NOT DISTORTIONS,
R.