Rubber band adjustable level slider

I needed a level holder for SN04. At the moment it is not possible for my to change the distance between nozzle and sensor in at the display and I don't want to connect always a computer when the weather is changing. There are some other holders, but I wanted a lightweight (less than 5g) slider where the rail is in the middle and the slider is longer.

Instead of springs I am using rubber bands to pull the slider up. The M3 screw is used to press it down. From outside you can't see the rubber