The small parts from the hardware store have never thought so right and were often too small.
So I created this ordered here.
This Filzgleiten cost certainly a little more, but they are worth their price. You only need a good pair of scissors, and off you go. When our landlord for the first time after moving in and came over he was very excited :-)
The communication with the seller was super. There were problems with shipping, because the post is not so as we wanted. But the goods came after a new delivery time with us.
So, folks, BUY!