Features:

• uses standart 4mm Bowden PTFE tube (~19mm)
  → insert the tube into the longer part of the assembly
  → use the gap in between the two sections
  → note the ptfe tube may be a bit loose which does not harm the funcion
  (use some superglue if you want)
• no screws required

Usage:

• insert a filament end on both sides (Like in the Picture top left)
• heat both ends with a (Clean) soldering iron (in the Gap)
• Pull the end on the PTFE side into the PTFE tube
• immeadiately push the other end firmly into the PTFE tube while securing the both ends
• wait ~10s
• thanks to the PTFE tube the splice should fit into your printer. You can use a blade to make it thinner if you need to
• you are done!

do this at your own risk. Be careful you could be burned by the soldering iron. Never heat the PTFE tube above its rated temperature.