This is a remix of the Simagic Alpha Mini Killswitch holder made by @Jordi that bolts together instead of glue to be removable. Used with a 26mm length of thread m6 bolt with a 10mm head that sits recessed into the holder for a cleaner look. Mine is connected to 8040 Tr120 aluminum extrusion to the Direct Drive uprights on the right hand side of the chassis.