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Old 02-19-2013, 08:02 PM   #1
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Set screw frozen solid in shower


I have two showers with the same exact setup which is a delta monitor single lever shower. The one shower is dripping from the up above shower head so I believe I need to replace the valve insert or whatever it is called. The problem is that the handle set screw is flat out welded on from all the scaling and buildup. I sprayed WD40, CLR to try to unfreeze it without any luck. The second shower is never used so I tested in there and i was able to turn the set screw with 1/8 hex. How can I remove the set screw? Drill it out? What size drill bit? I assume I would need a new lever after this?

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Old 03-18-2013, 06:30 PM   #2
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Set screw frozen solid in shower


Well I've been trying to drill this out without any joy. Do I need a special drill bit. The one I'm using doesn't seen to be budging the set screw.
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Old 03-18-2013, 07:15 PM   #3
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Set screw frozen solid in shower


Cobalt? Drills turning clockwise right?
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Old 03-18-2013, 07:21 PM   #4
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Set screw frozen solid in shower


The bit is turning clockwise. I didn't use a cobalt bit as I just used a bit that is rated for metal, wood, pvc. Do I need a cobalt bit? If so what size?
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Old 03-18-2013, 07:53 PM   #5
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Set screw frozen solid in shower


I cant see the set screw, but I would guess 3/16. Drill it out so you can re-tap the handle to take a 1/4-20 Allen set screw. That would be a No. 7 bit if memory serves. You can buy an Irwin matched drill and tap at HD or Lowes. Some of the other guys might know what size that Allen set screw is for sure though. Make sure you use a Stainless Steel set screw and put anti seize compound on the threads this time around.

Good luck to you.
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Last edited by jagans; 03-18-2013 at 07:55 PM.
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Old 03-18-2013, 07:56 PM   #6
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Set screw frozen solid in shower


Thanks for the info. The Allen head was 1/8 size. I'm actually needing to replace the cartridge because it drips. I think I will just replace the whole unit and the shower head as well if I can get the dang handle off
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Old 03-18-2013, 08:10 PM   #7
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Set screw frozen solid in shower


Try just drilling and re-tapping first. You may be getting in deeper than you really want, replacing the whole fixture. Maybe you had a cheap bit. Cobalt really cuts, you'll see.

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