Japanese manufacturers put out zillions of clones of American lunchbox radios. The clips were inevitably bottom barrel.
Some clips required battery "sleeves" to hold the batteries in place, without which the cells would simply pop out.
So I wired some 20 awg wire to a standard 9v clip. The cheap wire wouldn't straighten, though.
I wired two wires to each lead, because the + and - terminals are on opposite sides of the radio.
TIP: DO NOT connect the eliminator to the radio using duct tape!
I used electrical tape. Remember to connect the positive leads to the "spring" behind the outside connectors.
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The solution for the 1.5v X 6 C or D cell headache
In the late 1950s, C and D cells were easy to find, so inevitably Japanese engineers cut corners to keep costs down. Today, C/D cells are hard to find but 9v batteries are everywhere. Inevitably, many Japanese knockoff radios have the battery sleeves gone or severely damaged today. This is my solution. (The radio used is a Zenith Royal 700 knockoff from around 1959.)