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How to fix a faulty mount of drapery rods? - metal drapery rods

When I installed a curtain rod I drilled 1 / 4 "holes instead of 3 / 16" as shown. This does not seem a problem at first. But after one months, two (six years, top) drywall) on the anchor (middle. I do not know know exactly what is the best way to solve this problem.

Here is some information.
1. The stems are long () 144 ') and heavy (metal.
2. I combine two single bars, with three double hooks / holders are sold separately.
3. When not trying to find Mount, Stud. Thus Plasterboard Hollow only (maybe 1 / 2 ") is.
4. My daughter played with (including travel), the curtain a few times.