IKEA Nordmärke QI charger base

Had an old Nordmärke QI charger laying around and wanted to use it but not drill a hole through my desk. 

Tolerances on the Nordmärke are a bit uneaven from charger to charger so some sanding inside of the base might be requiered for a perfect fit. 

The inside radius of the base is 70mm and my Nordmärke was 69.70mm -70.06 mm so I had to sand a bit to get it to sit flush inside the base.