Makerslide mounts to 20x20 extrusion Idler mount to 20x20 extrusion stepper mount to 20x20 extrusion endstop mounts to 20x20 extrusion endstop mount to z-rodThe y-idler has been fixed and it is very nice - I've been using it for a week now with ZERO bolts, it snaps hard right to the 20x20 extrusion.Print usethe idler mount may require a fair bit of filing to get it to snap onto the extrustion, but once it does you wouldn't even have to put a single bolt in, it holds very hard to the extrusion.