Mounting a Voodoo Lab PSU to Pedaltrain pedalboard - Custom Boards pedalboard builder's guide

www.customboards.fi offers its services to musicians, who need help with the integration and maintenance of their rig. We import and sell top-grade effects, pedalboards, power supply units, cables and accessories. Our page also contains loads of tutorial content for building your own guitar rig.
Video is shot and edited by Marco Menestrina.

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How far through do you drill the holes?