New answers tagged size
Wouldn't the interior cavity and the knob need to have a clearance tolerance? Both the cavity and knob could not be 4.8 so either the knob is smaller or the side wall thickness is thinner to make for a larger opening. If you go by the graphic on Mr. Cailliau's website the side wall is 1.2 leaving a cavity of 5.4 based on the 7.8 overall dimension ...
According to LDraw, the slot is 8 LDU wide (1 plate, 3.2mm) and 5 LDU deep (quarter module or stud, 2.0mm). Here's the relevant quads from the LDraw file for reference:
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