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PostPosted: Wed Nov 08, 2017 2:05 pm 
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Hi there. A plumber installed a Mira 'Silver' Exposed Thermostatic mixer in our house about 4/5 years ago. The temperasture is now all over the place and I need to get the thermostatic valve out but to do this I need to get a grub screw out which is situated through a small hole about 5mm diameter under the casing. I cannot remove the grubscrew that holds the control lever in place. The 2.5 mm allen key fits but wont turn. I gave tried WD40 and its soaked for a couple of weeks with added squirts. I have tried to tigjhten slightly before trying to undo and I have tapped it with a punch but it still wont budge. I cant get a screwdriver hex bit through the concealing hole as its too small a hole and the allen key has snapped on one occasion as its only a 2.5 mm key and not strong. Any suggestions for getting round this gratefully received.


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PostPosted: Wed Nov 08, 2017 2:09 pm 
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I have deleted your other post. Please remember one thread per topic.


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PostPosted: Wed Nov 08, 2017 2:57 pm 
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You can get longer bits. But those small allen headed grubscrews are a PIA.
Try a good quality allen key.
If the hole is rounded try tapping in a torx or similar bit that is just oversize.
Final thing is to drill out. Retap, fit larger grubscrew. Provided there is enough material there to do that of course.
I had one the other day in a door handle. :angryfire:



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PostPosted: Wed Nov 08, 2017 4:24 pm 
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It's probably rusted solid, you will round it out or break the key (as you have round) before it comes loose. Drill it out as mentioned above.



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PostPosted: Wed Nov 15, 2017 9:47 am 
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Thanks. I will try and get a more robust allen key then tap in a torx or similar if unsuccesful. drilling final strategy!


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PostPosted: Tue Nov 21, 2017 9:49 pm 
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just had the same problem trying to take off a mixer tap handle. I drilled it out and managed to get the handle off (with a lot of huffing and puffing). Didn't need to retap as once the handle was off I could access it a lot easier

Be careful not to go to aggressive with the drill, I punch straight through the end into the soft plastic behind


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