Product looks good, but has a major flaw

Have joyfully receive items, unpacked and then it started already - on the box were drawings - but more washers and parts were supplied as in the manual can be seen. Great Rate and puzzle game. When I finally had everything together and wanted to mount, fell off me when mounting the screw, as I gently sloping on the toilet seat had the cap in his hand, it was Peng made and the and the small, thin plastic part, which hinge from below to keep the lid from above is abgekracht and flew somewhere, no longer found. This is very annoying, because otherwise I have the toilet seat very well-liked, but so what me is primitive long gone happens. Too bad. Made in Germany, but probably not a lot of testing.