Woodies Guitar Hanger GS

Well, this thing sucks! If my wall doesn't have a vertical slope, the design of this guitar doesn't work with the headstock angle of an SG model guitar which is the intended use of this hanger, right!?

Pros: It can carry the weight of your guitar.
Cons: Everything else.
The story is; after I drilled and screwed the top part of the hanger and slide down my SG down I noticed the neck was touching the wall in vertical position. (I didn't care much and) moved to positioning the bottom part and I realized there is no way that the bottom strap pin gets into the whole on the bottom part of the hanger. The headstock needs to be go into the wall for that to happen.

I unscrewed, put 4 washers between the wall and the hanger before screwing and tried again: Now I was able to put the bottom strap pin into the bottom part of the hanger. HOWEVER, it is not fully safe for the headstock. I was out of screw washers and couldn't improve it to the level it is safe for the headstock while taking/ hanging the guitar.

Lets say my wall has a horrible slope inwards after the level I screwed down the hanger part... Still, the design can give more space to overcome this kind of un-even surface problems. If my wall is not horrible in reality, design and therefore quality of the product is not good enough to make it usable.

I don't recommend for any guitar that has its top strap neck at the back of it and a angled headstock!
P.S.: I also tried with an Ibanez ART series jazz guitar. Same Issue!