Popping incomplete knockouts out

[ng3689]

I'm currently servicing my 2x f20t12 wraparound; I'm trying to move the powercord to a different knockout since the wires on the 1985 ballasts in the fixture are a bit short however the knockouts are only like scratches in the metal and I can't push them out. How annoying, I have this on several other fixtures, any tips on getting them out?

 

[Crazyjake8493]

If smacking it with a hammer and screwdriver doesn't work, then I'd go with a 7/8" knockout punch, step bit, or hole saw.

 

[ng3689]

If smacking it with a hammer and screwdriver doesn't work, then I'd go with a 7/8" knockout punch, step bit, or hole saw.

I'll try with the hammer, but I don't think it will work.

 

[Crazyjake8493]

You could also drill a 1/4" hole inside the knockout then bend that around with the screwdriver, but drilling the entire thing out would be faster.

 

[ng3689]

Much weaker than expected, worked like a charm! Thanks for the help

 

[Zeke]

For reference, next time use a socket large enough for the KO to open into and a pair of large adjustable pliers to push in the middle (or edge) of the KO. No beating required.

 

[yatg]

Usually paint or powdercoat makes it look like just outlines. BFH to the rescue.