Could be better the quality of her

For nearly a year my toilet seat loosens week. The seat stays in place permanently and the holder dissolves almost every time. Easy to be crazy!
Now I have bought and installed those things. The seat is now really bombproof. This saves me a lot of nerves and work ...
So why only 3 stars?
Deductions are available for:
- Quality could be better. These parts are too small for the hole in the bowl too wide and 6mm thread. You have to spend a lot of mind-boggling power and labor during installation.
Solution: In order to get the toilet Sistos into the bowl, I have the outside then smeared with detergent / soap. That went easier. Now I wanted to attach toilet seat. But the inner holes were much too tight. I had no choice but to dismantle the entire joint of the seat and lid and turn it into in the way too tight hole! In the long thread turning for a while. Then the lid and the seat came screws again to the joint, done.
- Price (Euro 4) too high for such a penny-item.

But I did not really care. Thus, the slipping of the toilet seat finally comes to an end, it was worth it to me. Both the money and the work! And these are the good 3 star. I would buy the toilet Sistos again.