Abrasive paper holder
This idea was already in my head for a long time..
This is a simple holder for strips of abrasive paper made out of wood profil and foldback brackets. The advantage is that you can make them with different edges and surfacehardnesses (by using a piece of neoprene or something between holder and paper). The shown example has a straight hard surface and rounded corners.
Sandpaper-holder
Grinding surface sandpaperholder
This holders are perfect for handsanding of small wavy workpieces.
The foldback brackets are just mounted with a screw and a washer.
The only a little bit complex thing in making this holders is to determine their length matching to the width of your preferred available sheets of sandpaper.
Dressed in steel 
Gute Idee. Hält das im Einsatz?
Die Klammern halten sehr gut. Und wenn man in Richtung des Holzes schleift klappt alles gut…nur quer dazu wird das Papier labberig
Probiere ich mal mit meinen Resten aus dem Lager.