I designed and printed a new flexiforce adapter. With this one, the sensor is fixed at a perfect position even if you move the cable. Also it is between two metal parts. Here you can see it.
I also had built a new box to get everything in a fixed place and see how it would fit. Here is the front of the box.
And here the back of the box with all electronics. You just need to plug in one USB cable and one Ethernet-cable for the raspberry-pi and power it up.
With this setup is absolutely easy to install the wire-cables for one robotic finger through these bowden cables. Plug in the cables and connect to rviz. ready to go