I used the geometry of a wonderful performing nutcracker to create this layered version. The aluminum and oak parts are screwed together. While I used nuts for secure the screws on the handles, I taped threads in the aluminum parts.
This build was done on a desktop cnc-machine by Stepcraft from 7 mm oak wood using a 2 mm spiral toothed flute and 3 mm aluminum cut with a 2 mm 2-edged flute.
After a nutcracking session it showed, that the nutcracker is not strong enough. I changed the drawing slightly and went with brass as main material reluting in a very rigded instrument.