As with the kit supplied filament spool, wrap tape around the end of your PTFE tube and insert upwards through the hole. I also added a piece of electricians tape over the edge of the dibond so that the bracket makes a tight fit and doesn't move.After using this for a few weeks, I found that the PTFE liked to slip down onto the lead screw, so I added a piece that covers the right hand rod and lead screw and provides a nice surface for the PTFE tube to run along. No more problems.