Originally Posted by Schumius
i´ve already did and then out of uncertainty i unfastened it and found that half the threads of the screw were gone by 50%, so does the threads in the eyelet, i wonder if this will make the rack less stable under weight?
From the image, I assume it's the left dropout, so I think you could use a longer screw and a locknut on the other side. This will prevent the screw from getting loose and will give you peace of mind.