I wanted to add this tool, which I use every single time I install new servos. I always us "servo screws", which are SHCS's with a "washer" built into the head. Normally I drill a 1/16" or 5/64" hole, tap the hole with this tool, then drip a little thin CA into the hole, to solidify things, especially for the cases when the screw cracks the wood around the hole a little, which is common.

I soldered one of those servo screws onto a ball driver, then gut a shallow groove along the threads with a Dremel cutoff wheel (difficult to see in my blurry close-up picture). I had used this for many years without that groove, but after splitting more wood during my last build, decided that I needed to actually kind of tap the threads, instead of just pressing them into the wood, like a bare screw does. I use this technique in my workshop to chase damaged screw or bolt hole threads. Sometimes that works better than running a tap through the hole, plus sometimes I don't happen to have the exact tap that I need. Cut a groove along the threads, and that lets chips and material removed come out, plus the edges of the groove do some cutting in the material. That's a mechanic / machinist trick.

This tool is easier and faster that just threading in / out a loose screw that you may drop down inside your plane.