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Something Hard Behind my Plasterboard

Posted: Tue Jul 04, 2017 6:14 pm
by Pukky
Hello all,

I am trying to put shelf on my plasterboard so i bought metal self driving fixation.

But after while i was unable to screw it deeper, because there was something hard.

I was also trying to find struct by tapping method.

Do you know what it is? And how to proceed?

Thanks!