Fischertechnik Disk with 7 holes

A Fischertechnik-Disk like "Drehscheibe 60" but with 7 holes.

This part can be used to build a 7-cylinder radial engine with Fischertechnik. You also need 2 of the heptagonal blocks.
https://www.thingiverse.com/thing:7330225
and a Crank Element.

It is an evolution of motors presented in an ft-Pedia article
https://ftcommunity.de/ftpedia/2026/2026-1/

A video how to build the motor with 5 cylinders is here:
https://www.youtube.com/watch?v=fX8JCQWT6dY