Square frame dowel rod jig
thingiverse
Here's a location jig for marking out bolt holes on roofs for solar panels and other items. This jig uses 11mm dowel rods and 8mm dowels. **Complete Instructions** This is part of an Instructable called One-Person Solar Panel Installation Kit, accessible at https://www.instructables.com/id/One-Person-Solar-Panel-Installation-Kit/.
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