I have a pretty old caravan (1994). The caravan has roller blinds and flynets behing every window. The hook that locks the flynet in place breaks off very easy. Buying a new part is impossible, you should buy a complete new combination roller (€80).But with these parts (left and right) you can just print them. Just cut out a small piece at the back of the original guiding for the bigger hook.I printed it WITH SUPPORT, at high quality it takes about 6 and a half hours to print two.