The following picture shows a filter module on my shower mixing valve. The piece won't unscrew and the 10mm Allen socket is stripped. I tried heating the piece with a heating gun but it didn't make any difference.

At this point, what our my options for removing this piece?

enter image description here

  • Brass is soft. Before you stripped the bolt head, you needed some sort of penetrating oil (WE-40™, PB Blaster™, or the like) to try to get into the threads to loosen any gunk built up and lubricate. Now, probably your best bet is crip659's mechanical methods or a full on replacement.
    – FreeMan
    Feb 17 at 12:14

1 Answer 1


Choices for that problem are to force a bigger(11mm) allen wrench/allen socket tip in, maybe with the help of a hammer.

If possible cut a slot in the top for a flat bladed screwdriver.

After watching the video, might be able to drill two holes on the sides of the head and use two rods/needle nose pliers to turn the head.

Use a drill and drill out the screw/bolt.

Not quite sure but soldering/silver soldering/blazing a nut on top might work.

Will depend on how tight that screw/bolt is in the threads.

  • Video? I missed a video??
    – FreeMan
    Feb 16 at 22:59
  • @FreeMan Was in the question OP asked earlier on removing the other filter.
    – crip659
    Feb 16 at 23:01
  • @crip659 The crew is extremely tight - before I stripped the socket, I could put my entire weight of 225lb on the 10" long allen key.
    – Wynne
    Feb 17 at 0:56
  • Might just have to go with drilling out that screw if that tight. That is almost enough to put a curve in the key.
    – crip659
    Feb 17 at 1:02
  • 1
    Penetrating oil plus tapping with a hammer might help, but you do not have a good turning connection point any more. Check with the filter that does come out and see if there is enough metal to drill two holes to place steel rods/allen keys and to use a wrench/piece of metal to turn.
    – crip659
    Feb 17 at 1:35

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

Not the answer you're looking for? Browse other questions tagged or ask your own question.