Step 4Summary: DIY Spacers & slugs (adjustable battery spacers from junk in a pinch!)
Old Button cells(dead), older smaller cells N sized or L sized, hardware like a 5/16 Bolts and hex nuts can be "filled" with solder.
Plastic 'tubes' or teflon tape will insulate from walls or other cells for width.
Springs and adjustments to original devices can be used to accomidate most batteries ...see below...
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