With Marcus_543412 formidable model https://www.printables.com/model/1296555-opengrid-removable-screw-mount . As is takes some force to actuate the screw-mechanism. If it is done with a coin damaged edges of the slots are a common consequence. So I looked for a solution which serves me well and I now try to share with you. A warm thank you to Marcus_543412 for his work on OpenGrid and for sharing it!