replying to fred, Iggy wrote:
It's for the corded Carvex Jigsaw (or other tools), when fitted to the CMS
(Compact Module System) table plate. The Carvex power button gets slid to On
and the plastic tab gets inserted behind the switch to keep the power on. The
Carvex cord then plugs into the CMS and the Carvex's power is now controlled
by the CMS's switch.

Here's the only video I could find right away to demonstrate, see about
halfway through the video - "Festool TV Folge 25: Pendelstichsäge CARVEX PS
420 - Einbau in das CMS" https://www.youtube.com/watch?v=H01if9-GG7c If you
lose the key at anytime, I suspect a coin or similar piece of plastic, metal
or wood could be substituted.

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