This is a modification of my first spindle mount designed for 60mm rail used on the OX CNC. On this bracket the holes are positioned to fit an 80mm rail used on the popular C-Beam based machines.
It will be made in 10mm (base) and 20mm (bracket) aluminum.
Fusion360 link: A360

43mm Spindle Mount for 80mm Z-axis 2018-12-19
Spindle Mount for 43mm standard Spindles like Kress. Fit 80mm rails used on C-Beam machines