If want to use a http://www.thingiverse.com/thing:4042 together with a http://www.makergear.com/products/plastruder-replacement-parts style grooved insulator on your mendel then this bits help you achieve that.Print and clean all the parts and align then:1) slide insulator into cartmount 2) slide plug over the top of the insulator 3) put brutstruder on top, but don't attach any bolts yet!Now some nuts & bolt work:4) run M3x20-ish bolt thru the cartmount, plug and brutstuder mount hole below the springs and fasten it using a captive nut 5) attach plug to brustruder using an M3x16-ish bolt and fasten it using a captive nut 6) find a way to attach the tip of the plug to the cartmount since there is a small clearance issueAnd finally attach it to your mendel X carriage