Summary

This allows you to measure the stroke on your X52 (no pro) joystick. Probably fit the Pro version as well. Simply put phone on top and use a leveling app on your phone then calibrate the app. I used a P20 and an app called bubblelevel by HSCN Apps. The stroke is +-26 degrees. The free version works well but I recommend updating to Pro version anyway (it´s cheap):
http://play.google.com/store/apps/details?id=com.hscnapps.bubblelevel

The software “Poswdm.exe” is very useful. It´s a dos program from 2008.I guess I got it with an old joystick. (MD5: C2753C5F6B18198C22359FD60E85537C)
The model is a combination of STL files and Fusion 360 modifications so it’s a mess but I include the fusion 360 files anyway.
Original phone holder:
https://www.thingiverse.com/thing:2368959

Parts needed:
A hair band or rubber band
2 M3 screws

Update:
Added a “frame” fore the throttle as well. Secure it and the phone with rubber bands. Do not use tape since it will remove the rubber surface on the throttle.