Using rubber webbing, I made a new seat diaphram spring. It was much cheaper than buying a new one from minimania and functions nearly as well.
Some fresh foam and the new covers.
I reused some of the original wool padding streched thinly around the frame to cushion the metal. I didnt reuse the horse hair cushion though...

The finished product. I tried to keep an original look, while only doing minimal sewing.







