Yes i glued the the FSR with adhesive tape to bottom metal plate. Also i glued with adhesive tape the M8 nut to the FSR. If i pressed this FSR only between to flat plates they did not respond. I dont know why. Maybe this FSR's have been a little bit special. Maybe they only respond if the pressure is inside the outer 1mm Ring of this FSR's. This outside Ring looks also a little bit higher then tby Romank - Delta Machines
Finally i found a easy way to fix the FSR's to 3DR. used a metal-plate (side panel from a old computer.) fixed it to ground base glued FSR with double sided tape to it. used Magnetic stand off to fix the glass. Had to use some M8 nuts over the FSR. otherwise they did not work.by Romank - Delta Machines
It worked also with only one FSR. But on 3 feets it's more stable then on one. It's also for sure easier to install as a servo. The only thing is to fix the plate so that its's fixed in x/y and can a little bit move in Z. The costs are around 9,09€ * 3 if you use this onesby Romank - Delta Machines
Thanks to Richrap, my printer is alive. I tried to put FSR to put to the bed. Connected first only 1 FSR to Heatbed Tempsensor. Installed the Marlin FSR branch. Used Pronterface as host. putting G29 command to g-code startup Thanks also to Johann Rocholl http://reprap.org/wiki/FSR Works fine, see video. https://drive.google.com/file/d/0B0f_LnsO5II6MUYwMmYwdzRzQTg/edit?usp=sharing Has anyonby Romank - Delta Machines