I started thinking a bit about my special tool for intonation, the one I have used so far is really just a prototype, although it worked very well.

One thing that distinguishes the measurement from the finished saddle is that only one of the strings, the one I measure, has the right height above the bridge. It can be assumed that the force that bends the neck becomes slightly greater with all the strings higher in the position they get when the saddle is finished. Even if the effect is small, I want the measurement to be as accurate as possible. To emulate the finished saddle, I made small adjustable "saddles" for each of the strings. A small brass plate had two threaded holes and two 6 mm adjusting screws. The height of the "saddle" is easily adjusted for each string.

To make room with the special tool between the adjustable "saddles", I redid the part where the string rests and made it as narrow as I could, 12 mm. With my new Proxxon KG 50 it was easier to cut to the square steel rod nicely and jack out the ditch for the string. I have also obtained some carbide drills in good quality (1,5 and 2,5 mm) to drill the holes.

We'll see how it works at the next measurement of the intonation, probably no major difference but better!

Edit: Started thinking about weight. A saddle weighs only about 4 grams, while all the parts above together weigh 15 grams. I have ordered set-screws in nylon that should reduce the weight by one gram and also cut off 4 grams of unnecessary material on the tool. Still about 6 grams heavier than the finished saddle, but I have to live with that. Here is the tool 1.2 after dieting.