Recently, we tried to install a license plate on a new used car. When we took the plate holder out of the truck, it had only two screws on it. "No problem," I thought, "Just unscrew them and take them to the hardware store to buy more." Except the screws were bent and stuck. When I tried to unscrew them, the threaded metal insert spun but the screw didn't come loose. There wasn't any way to grab the two parts separately.
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| Bent and seized screws with old metal inserts |
After a lot of unsuccessful attempts with different manual screwdrivers, battery powered screwdriver, pliers, etc., I decided to try replacing both the screws and metal inserts. I used a screwdriver and hammered the inserts out. Then I found a small nut and bolt to replace it.
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| Heating the hex nut |
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| Pressing the hot hex nut into the plastic |
I threaded the nut onto a longer bolt so I could hold it with pliers. Then I heated the nut with my propane torch, and then pressed it into the plastic where the old metal insert was. The hot nut melted into the plastic, which re-hardened around it when the plastic cooled. The hexagonal nut is slightly larger than the hole from the old insert, and its shape makes it less likely that it will spin in the plastic.
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| Repair completed |
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