Loctite thread locker question

I have used blue loctite many times over the years but not sure how it would function on plastic. I've had issues like you describe and a few times I was able to drill the screw hole in the plastic a little deeper and use slightly longer screws.

No, use extreme caution using thread locking compound with plastic. Many are incompatible and can cause the plastic to basically crack and crumble.

Threadlocker is not a fix for a worn out plastic threaded hole.

My suggestion is- get yourself a small screw assortment of sizes, and use the next larger size up, or a longer screw to reach deeper and grab more threads when possible.

as an example

Another option are screw post repair methods.

The metal cap method helps to prevent a mostly intact post from cracking.

If the post is very damaged, cut it off using a dremel and glue a repair post over the original.

@Vernon Barry posted:

2 methods.

or

https://www.mthpartsandsales.c...h/?type=serviceparts

Thanks, unless someone can recommend a thread locker good for plastic, changing the screw is maybe my only option. Attaching a photo from the Kline caboose.  I assume is metric, since the caboose is made in China.  It looks like it is 9mm long, does anyone know the thread size, and a good source for tiny screws like this?  Thanks.

There is no thread locker for plastic. Vernon touched upon the hazards of thread lockers on plastic parts. One of the best methods I’ve used for repairing worn out or damaged plastic stand offs is making a sleeve out of brass, that fits snugly over the stand-off, using JB Weld to affix the brass tube to the stand off. Then back fill the stand off with JB Weld using toothpicks to shove the JB down in the old threaded hole. Alow this to cure, then drill a new hole.

Pat

@TraderAlex posted:

does anyone know the thread size, and a good source for tiny screws like this?  Thanks.

I posted a link- clearly you did not use it.

@Vernon Barry posted:

My suggestion is- get yourself a small screw assortment of sizes, and use the next larger size up, or a longer screw to reach deeper and grab more threads when possible.

as an example

@harmonyards posted:

There is no thread locker for plastic. Vernon touched upon the hazards of thread lockers on plastic parts. One of the best methods I’ve used for repairing worn out or damaged plastic stand offs is making a sleeve out of brass, that fits snugly over the stand-off, using JB Weld to affix the brass tube to the stand off. Then back fill the stand off with JB Weld using toothpicks to shove the JB down in the old threaded hole. Alow this to cure, then drill a new hole.

Pat

This is exactly how I fix most broken shell posts.  I use JB-Kwik as I'm impatient and don't want to wait hours after I do the repair to move on with my project.