Ruler depth stop / marking gauge

Depth stop for 20mm wide metal ruler to use it as a marking gauge. Nothing special but every project I found online needs external metal screws or some work to use it as a marking gauge.
I ve tried to do somethingh thath is ready to be use without any external tool or component.
You can easily broke the support inside the mouth of the body by pressing with the ruler.
Ruler doesn t have a super thight fith before turning the screw but you can easily set the perpendicularity with the body by checking the same measurement on the left and on the right side of the ruler, then you can thight it.

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