Can't fit dimmer switch as screw holes in metal box obstructing

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I bought a dimmer switch. When I tried to put it in, it would not go in, as the screw holes at the TOP and BOTTOM are obstructing it.

I noticed my metal box has screw holes on all 4 sides. Even new ones from B&Q were the same.

Do people bend back the unwanted screw holes? I tried to do it on a new metal box, but the metal was pretty though.
 
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You don't always need to snap them off fully, they will probably push back into the void they were punched out from
 
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All of the ones we seem to fit have 4 lugs. Seems to not matter what wholesaler they come from, most all of them are 4 lug.

Plasterers usually slap so much wet on it doesn't really matter, the lugs are often 10mm shy of the finished wall level anyway
 
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Could be worse. I knew someone once whose plasterer completely filled in all of the boxes in an extension being built.
 
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He was fortunate, timing wise, to be able to see the rectangular patches which didn't dry as quickly as the rest of the walls...
 
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All of the ones we seem to fit have 4 lugs. Seems to not matter what wholesaler they come from, most all of them are 4 lug.
Indeed, I've been with my current employer for over 10 years now, and we have always had 4 lug single boxes. We mostly use Appleby. An old slotted screwdriver and a tap with a hammer is how I get them out of the way.
 
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I may be going mad, but I seem to recall one reason for 4 lugs on the single box was because one face had a 25mm knockout, though not sure if thats still the case
 
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Well, that may be the case with a 35mm box (it is) but you won't get a 25mm knockout in a 25mm box....

We use 35mm for HDMI with brush plates, purely because an HDMI plug won't fit through a 20mm knockout (n)
 

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