Made by Kamil @Kamil_233016 - many thanks !

This router template may be used to create short and long keyhole slots for picture frames. It is meant to be used with a 3/8" keyhole router bit (such as the Freud 70-104 or Rockler 92024) and a 5/8" short shank template guide bushing.

This model is parametric and can be customized with OpenSCAD to produce slots of any length (see original from Kamil).

Instructions

Use double-sided adhesive to secure the template.

Lower the router bit so that cuts a keyhole in the middle of your workpiece (approximately 7/16" beneath the template for ¾" stock)

Align the guide bushing into the template and begin routing.

Notes

It is beneficial to use dust extraction when routing the keyhole slot since sawdust is not easily ejected from within the slot during routing.

A pilot hole may be drilled with a 3/8" or 10mm Forstner bit prior to routing the keyhole slot. Doing so reduces the amount of work performed by the router and allows the router to be more easily used with a fixed base instead of a plunge base.

Picture Frame_Hanging Keyhole Jig