Use the notched connectors to prevent rotation. Include single and double connector versions. Double version comes with a short mount. Secure with a piece of filament: align the connector with the face of the print, make sure the connector it is not sitting proud of the finished surface. A piece of 28-30mm, 1.75mm diameter filament will slide right through.
The filament won't work if you mount the roll pins on the connector - but inserting the filament will act as a roll pin itself.
Bulkhead hole: 30mm, thru.
The author remixed this model.