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After cutting the 59 mm hole for the fuel sender, I needed to get some chips out of the tank.
It worked well to get a small 110 VAC floodlight bulb and socket that would fit into the fuel cap hole to light the inside. To remove chips, taping a painters tack cloth to a long stick made it really easy to pick out random chips and make the tank inside clean and ready to seal the sender.
Larry Zepp - Zodiac 650B builder