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Editing Step 20 —

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Roughen a corner of the spring terminal adjacent to the smaller hole (the one that doesn't have a lip)

Put a blob of solder over the roughened corner

Cut four 1m lengths of 20awg stranded wire (two will be used now for the first battery tube and two will be used for the other battery tube)

Strip about 1cm of insulation and tin one end of each of the four wire lengths

Put one of the tinned wire ends through the smaller hole (without a lip) on the base of the spring terminal and solder it to the base (basically bend over the solder blob and heat to attach). (NOTE: The spring terminal will get very hot so it’s best to hold is with helping hands or pliers.)