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As a kid I made candles out of them. Pour wax in bulb let harden then break glass. Use hot ice pick to melt a hole for wick. Sold a bunch in the 70s!
I would like to add a couple comments to this excellent instructables. The lead free solder will not have a shiny surface like leaded solder has. When clipping wire leads take another look at the soldered lead. Some times clipping the lead will fracture the solder and cause problems down the road.