Side tracking the discussion a little bit, how do you make the sill line up straight? I'm having the hardest time to get them look good.

Here is my fan control knob design, it is based on the knob from thingiverse.com/thing:2704579/
This original design needed some corrections in terms of side and slot location, plus some additional details.

See some images after install:
a.jpg c.jpg b.jpg
Files:
A bit recessed.stl
More ...

When and where can I buy? Count me in!

https://www.youtube.com/watch?v=4UpNO7qswNI

Prior to using this tool I have always been tensioning by feel and although I never experienced any issues, I was always curious what "new" vs "used" tension might feel like. I noticed that by tensioning the belt such that the water pump can barely ...

When measuring the tension using this tool, does it require the crank to be turned back 10 degrees?

I hope this comes in clutch! I shall print and try out!