Springs for homemade isolation stand

I had Koni's on my car when I was a kid. They were great new but after a bit of use they softened up and were a little mushy. I always thought I should have changed my springs as well.

Take a look at the Minus K stands. They only use springs. It is amazing how effective they are based on the video.

I might try the bubble wrap. I am using Stillpoints under my turntable. The sound improved w. deeper bass & improved clarity. I just feel that a good isolation stand improves a system substantially. I don't want to spend hence the idea of using springs. If any of you have seen the Machina Dynamica or the Minus K they use springs to isolate. Sounded interesting if I could make my own. I agree about the dissimilar material idea & even the car tube. The bubble wrap sounds interesting in a cost perspective. I will pick some up & post my results once I get it done. My turntable w. the base from the Sound Anchor stand is over 200 lbs at least. Now to find some friends to help lift it.

Rather than spend for an islation rack for $2000 or more $ I would like to use some springs to suspend the top shelf of my rack. If I knock lightly on the rack the feedback goes through to the turntable. I can use isalation feet but have a feeling springs will be less expensive & more effective. Some of the most effective isolation platforms in use utilize springs in compression between two boards. I am hoping to attain something as such.