Tools for checking if mallet heads conform to the rules

Hey everybody,
I cobbled together some quick 3D models and explanatory drawings for three tools to check if mallet heads conform to the current EHBA ruleset. Unfortunately I can’t seem to upload the STL files so feel free to hit me up in private if you want to have a look at them.
HeadDiaChecker.pdf (45,8 KB)
HoleDiaChecker.pdf (43,2 KB)
WallTHchecker.pdf (43,0 KB)
I would be happy to receive some feedback if I have understood the specifications of the ruleset correctly and if you see any technical flaws in them. Of course, feel free to print them yourself and try them out:)
Greetings, Jules