I am trying to put on roller blind and I recently posted here about screw and anchor size bit drill but I did the experiment prior to asking question, but now as you can see the top (marked red) hole seems empty but it took 3 anchor inside!
- So my first question is how to fill/closes these holes? To drill again:
- How to find right bit size for anchor? In a haystack of bits?
P.S - How do I know what kind of wall is it? It look like cardboard material.
