GMC brake booster output stroke measurements

 Original motorhome booster, a "metric" replacement and Hydroboost. These are output rod strokes.

I used these straps and a rod to hold the input rods all the way in.

Galaxy S4 screen replacement

Samsung phone fix. We found very good instructions on youtube here
https://www.youtube.com/watch?v=KyC8ctDFhg8

Master cylinder shootout