My original plastic nut (the white round nut in the cover picture) to secure the solar panel to the holder was mistreathed and couldn't strongly hold the solar panel anymore. Therefore I designed this replacment nut.

Print in PETG for some flexibility in the material and it is suitable for (warm) weather conditions.

There's no thread in this nut, but if you hold the ball head bolt with pliers you can thread it in the nut reletive easily.