Springs under turntable

Uberwaltz, the 401 is a heavy turntable. To do this even close to right you have to find the center of mass of the table and place three or four springs equidistant from that point. Then you have to get the spring rate low enough to get you under the 3 Hz limit. At best the situation will be wobbly. You could put the springs in cylinders and add heavy oil for damping and the engineering continues. The more stable way to do this is to hang a solid platform with springs. Look carefully at the SME 30/12 turntable. You could replicate this situation without too much difficulty. 
If you are not into this degree of experimentation you probably should leave things as they are. The MinusK platform although expensive really is the best solution for unsuspended turntables. You just weigh your table and they will send you a platform with the right spring rate.

Mijo
I have been looking at the MinusK but a lot of $$$
The Nobsound are a cheap experiment and as I said if I still cannot make them work to my taste under the 401 I have plenty of other pieces of gear to experiment with...lol
It will not be $65 wasted for sure.

Noromance 401 is pretty similar ( heavier as he has an aftermarket heavy platter, mine is a standard platter modded for extra weight) and I am sure comparing notes I can get close to what he has achieved so far

In addition to stiffness, I believe the issue may also include a component of compression/travel, which is related to the number of winds.

Correct Mitch.
When I bought mine I spent some time going through various spring calculators including coils per inch and wire thickness and wire material (which ALL affect compression ratio!), who knew there was so much involved in the humble spring!

« Almost all physics can be reduced to springs behavior and the residual part was never understood anyway» -Groucho Marx

Certain engineering evaluations can be solved (approximated) by modeling the behavior as a series of springs and dashpots.