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Sony TC.-730 voltage selector knob

We lost the voltage selector knob off the Sony TC-730 RtR tape deck. At one time, we got around this by putting a thick insulated wire between the 2 matching holes. However, this fell off one day and now we dont remember which holes are the correct ones. Can someone tell us which holes are the correct ones for 120 volts? Also, we got hold of a Sony TC-580 RtR tape deck to use as a parts machine. It has a regular 120 volt power outlet that doesnt use a volta ge selector knob. Is it possible to convert the TC-730 by swapping the power panels of the 2 decks?



Sony TC.-730 voltage selector knob

You need to tie the center pin to pin 3 for 120 operation.