Ultimaker Original Feet with Silicone Dampener

I designed a new foot for the Ultimaker Original. It has a hollow base to pour with two-component silicone. After printing turn it head down, mix around 18 ml silicone and fill it up to the top level. When the silicone is done seperate it with a knife from the outer walls and then remove the frame. The 3 holes are spreading inside so that they tightly hold the silicone. The silicone I use is permanently very soft and the printer swings on it. If it's too soft you can easily just take regular sil