Adjustable Endstop holder for Delta Kossel with 2020 AL

This holder for cheap standard chinese optical endstop PCBs is height adjustable via M3 bolt, that pushes against the upper edge of the vertical linear rail mounted on 2020 Al extrusion in delta kossel printers like the Anycubic Kossel Linear Plus.
The endstops are mounted with M3x12 bolts and M3 nuts. The holder itself is mounted with a M4x6 bolt and a hammer nut in the extrusions groove.
The adjustment bolt should be at least 16mm (what gives 1mm height adjustment - when you need more you sh