A $300-$400 turntable tweak

On your direct drive you might want to consider the impact of added weights and peripheral clamps as it may be negatively impacting the servos which have been designed for the original mass of the original platter.
On my Final Audio Parthenon it uses a 1.2kg gunmetal weight which has a proud rim around the bottom. The copper mat has an indent for the record label.
A washer sits under the record and the weight goes on top of the record. What I have found useful is that I have made several washers of varying thickness to optimise the flattening of the record. Obviously a peripheral ring might be better.

Ct0507

With a centre weight you get rid of the lifting record edges by optimising the thickness of the washer under the record. When you get the right thickness of the washer you can get the records flat around the perimeter.

Dover -
Yes I agree and that is what my post was about.maybe I wasn't clear.

my post started by implying the manufacturer sold me a weight without a washer. 800 grams worth. It lifted the edges of dish warped records. The other clamps I describe all use have the washers underneath and work great. BTW regarding sp10's torque. People have stood on it in the old days and it spins them.
There is absolutely no concern (my opinion) to what a weight any weight will do to an sp10. It does nothing to the speed rock solid.
My post was strictly about flatttening the records.
No less no more.
Some weights sounded better in my rig then others.
To the others - Experiment and find out.

Thanks Jonathan,
I have a 450gm centre clamp on my belt-drive Raven AC-3 and a 640gm clamp on the DD Victor TT-81.
Both clamps seem to improve the sound but at least never do harm.
Based on your impressions I shall continue to use them :-)
Do you know if your adjustable weight clamp is still available?......and if so, do you have a link?
Cheers
Henry

Jonathan Carr using a direct drive turntable,...WHAT!
Would someone please speak up and set this guy straight,...

Johnathan I am a recent convert to your Kleos cartridge and now I am hooked, that is not easy to do and now I have to listen to the Olympus.

Regarding centre weight's and or peripheral rings, I don't use them on my tables. I sooner play with special platter mat's, new and vintage.