This seems to be a problem that boombox collectors will experience at least once. Here is some advice for three different situations. Thanks to Superduper and SINISTER.
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To repair stripped threads:
One method is filling the hole with super glue or an epoxy that will completely harden. Drill a small pilot hole and then rethread.
To rebuild a missing screw post:
Use brass tubing that has an inner diameter the same as the outside diameter of the original post. Be sure to trim the length of the brass tubing as close to the original post. Fill the tubing all the way to the rim with J.B. Weld or something comparable. Make sure you get all the bubbles out when you fill it. Also, make sure you seal the bottom of the tubing as the filler may leak out the bottom if not blocked. Once completely hardened, the new post can be drilled for the screw.
To repair broken / snapped posts:
For broken posts, use liquid acrylic solvent available at any TAP plastic store. You use it in conjunction with a plastic bottle and needle syringe, also available there. It melts the plastic (literally) and welds the peices together. The resulting repair is as strong as the original because there is no foreign material. Once properly cured (evaporated), the break is literally fused together. The only thing is that you have to have all the peices because this is not a filler type glue, rather a solvent to weld peices together. If a peice is missing, it will always be missing although it is possile to fuse the available peices and when cured to full strength, the void is then filled with an appropriate plastic filler prior to painting, if necessary.
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To repair stripped threads:
One method is filling the hole with super glue or an epoxy that will completely harden. Drill a small pilot hole and then rethread.
To rebuild a missing screw post:
Use brass tubing that has an inner diameter the same as the outside diameter of the original post. Be sure to trim the length of the brass tubing as close to the original post. Fill the tubing all the way to the rim with J.B. Weld or something comparable. Make sure you get all the bubbles out when you fill it. Also, make sure you seal the bottom of the tubing as the filler may leak out the bottom if not blocked. Once completely hardened, the new post can be drilled for the screw.
To repair broken / snapped posts:
For broken posts, use liquid acrylic solvent available at any TAP plastic store. You use it in conjunction with a plastic bottle and needle syringe, also available there. It melts the plastic (literally) and welds the peices together. The resulting repair is as strong as the original because there is no foreign material. Once properly cured (evaporated), the break is literally fused together. The only thing is that you have to have all the peices because this is not a filler type glue, rather a solvent to weld peices together. If a peice is missing, it will always be missing although it is possile to fuse the available peices and when cured to full strength, the void is then filled with an appropriate plastic filler prior to painting, if necessary.