Soldering wires onto System 1 replacement connectors: tape the parts to the glass
Some original Gottlieb System 1 connectors (such as the 21-pin) are no longer made, so solder-on replacement connectors are used instead. To solder each wire without a third hand, tape the connector to the cleaned playfield glass, lay each stripped wire on its tab and tape the wire down, then solder. Slide heat shrink over each joint so neighbours cannot short.
Systems
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Source: Pinball Repair help group!! (Facebook group)