Simple dowel jig to help you get the hole where you need it and keep it vertical.

Uses two ubiquitous skateboard bearings (22mm Outer D x 8mm Inner D x 7mm Wide)

With the spacer it guides the hole center to be 10mm from the edge.
Without the spacer the hole center will be 20mm from the edge.

Please be careful when drilling.

Creality

No

Yes

0.16

25%

Print the main body upside down, with support.
Some filing required to get a snug fit for the bearings and spacer; depends on accuracy of your printer.