Place two lengths of strapping tape exactly adjacent to the tone arm base plate. This is a “ballpark”
reference marking, which will be improved upon.
Use a depth gauge, or a digital calipers (this example) with a depth extension rod. First, measure near
the front of the turntable plinth (left below), and then near the rear of the turntable plinth (right below):
6
On the tone arm base plate, locate the four mounting holes (with a slotted sliding depression between
each pair). Use a sharp pointed compass needle to scratch the outer rim of the four mounting holes on
the turntable plinth’s bottom. Center drill the four mounting holes into the turntable’s plinth.