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thread gone

My automower have been opened too many times/with too much force, so the thread is gone some places.

Could I use some building silicone I'm the holes, or will it come out the next time I unscrew?

  • I've used hotglue to fix something like that, just squirt it in and muscle the screw – dandavis May 19 '18 at 3:17
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I think you're right that using silicone or some other filling compound would just come out after unscrewing a few times. Personally I'd look at replacing what I assume was a self-tapping screw with a metal thread screw and use a threaded insert such as the following:

Threaded insert

So just drill out the hole a bit for a tight fit of the insert and add a little epoxy to hold it in place. Alternatively you could try to do a similar arrangement using a standard nut by drilling to a fairly shallow depth at the bottom at a diameter just large enough for the nut and using epoxy to hold it in place.

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    Because this is similar to your answer, it's a comment instead. Metal threaded inserts made to be installed in wood may be a better choice, as there are outside threads or teeth to grip the plastic. Added epoxy as you suggest certainly makes for a solid solution. – fred_dot_u May 18 '18 at 18:24
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Filling with jb weld or another epoxy and drilling a new hole may be the easy way to go, but a heli coil will also work just fine, I use the standard metal heli coil inserts all the time in plastic.

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