Window fastener

[marioxp]

Dear,

On my bavaria one of window fastener dropped out, the screw loosened.

Problem is that I can't find the nut.

If nut is regular nut I can replace it, but how to fasten it!

You can see from the pictures that I can't approach the nut to tighten it.

Will I have to remove the whole window just to tighten nut?

If this is true this is a bad construction.

[SYJetzt]

There is no dedicated nut. There should be a thread cut in the Window frame!

[marioxp]

Yes, you are right.

The thread is completely worn out due to corrosion.

What are my options, what do you suggest.

I'm thinking of gluing the nut with epoxy glue on the inside.

the other thing that comes to my mind is to make a thread for a larger screw.

Best regards,

[MagicalArmchair]

Golly, the trouble I had with replacing all of those when I replaced my windows. Each window probably took me two hours due to galvanic corrosion between the machine screws and the ally frame.

In your situation I would use a thread repair kit to helicoil it. Bonus being it'll then be stainless into stainless once you are done.

https://www.screwfix.com/p/helicoil-eco-thread-repair-kit-m5-x-0-8mm-14-pieces/887fr

The idea is you drill it out slightly oversized, tap it, then screw in the thread repair, then screw in the machine screw. There should be enough "meat" there to allow you to do it?

How I hated changing my windows... all nice and sea through now!

[marioxp]

Thx!

I will try with helicoil, i.e. some helicoil-like product.

[marioxp]

Golly, the trouble I had with replacing all of those when I replaced my windows. Each window probably took me two hours due to galvanic corrosion between the machine screws and the ally frame.

In your situation I would use a thread repair kit to helicoil it. Bonus being it'll then be stainless into stainless once you are done.

https://www.screwfix.com/p/helicoil-eco-thread-repair-kit-m5-x-0-8mm-14-pieces/887fr

The idea is you drill it out slightly oversized, tap it, then screw in the thread repair, then screw in the machine screw. There should be enough "meat" there to allow you to do it?

How I hated changing my windows... all nice and sea through now!

Thanks for the advice! I have never heard of this thread repair tool before.

I successfully fixed the thread with a V-coil, it was easy.

[Krumelur]

After I read your post I immediately took note to fix the wiggling screw in the aft head.
Then, I checked the other windows and noticed that all of the screws on all windows are wiggling! I tried to tighten them but they would not move - but they're not falling out either. It's almost as if the whole construction is meant to be flexible a bit. It's not the screws that are moving within their threads, but more like the complete setup of the window.
Now I wonder if something is seriously wrong with all windows or if it's meant to be like that so that the windows can be closed 100% water tight?

Have you noticed something like this too?

And related to the used inserts: did you use ones made of steel? I'm concerned about corrosion using steel coils in the aluminium frames. Not even sure if Duralac would help in this case. The surfaces are tiny.

[marioxp]

Unfortunately, the coil is made of steel.

And I noticed that the other screws are weak too, I don't know if Duralack will prevent corrosion completely.

As I searched the internet for thread repair, I came across special adhesives that are used when the thread is still holding a little. Maybe this could be the solution.

I understand that corrosion always occurred when you have two dissimilar metals, but you also need salt water. This are windows which are exposed to rain not salt water.