The "Gumminöppel" to protect the wall, are just very convenient for the price. If you think the bar was too loose and not can continue to move out to make the bar a little "solid". It is recommended after the Einpassgröße is reached, the bar always be increased to one side slightly and extend a little more, and down again, as long as the rod to a somewhat "stable" has just (:
I've made a little "shake test" and the rod held, only when you move the curtain to watch something, you could "stutter" at the "pulling edge" of the rod slightly after the fall .. ^^
Otherwise, for the price, the material is well made and my expectations were met. I would definitely recommend (: