Adjusting Screw for Lechuza Balconera planters like the ‘Balconera Cottage 50 granite’ (https://www.lechuza.world/promo/balconera-cottage-50-granite/15602.html). The adjusting screw has a wider head than the original.
Thanks to Lechuza for providing details about the thread (DIN 405 knuckle thread).
The author marked this model as their own original creation.