You are more then half way down the road jackie_w
Just delete the .x50
part of the template filename, so that it will read: userCSSValues.js
After a USB connect/disconnect cycle or a restart, you should be good to go.
that your new values for line-hight will NOT change the button-caption in the extended Size-Overlay.
For all regular users of 2.1.01a and 2.0.18, who just upgraded to 2.1.02a I suggest to have a look at:WhatsNewIn2_1_x