Molina Teflon cone black 9mm

Application:

What you should have ready:
Your new Molina 9 mm Teflon tenon
2-component epoxy adhesive, e.g. UHU Plus Endfest – do not use regular all-purpose adhesive!
A cordless screwdriver or drill
A metal drill bit – measure the exact size at the thin end of the new tenon
A sharp utility knife or a small nail file
Fine sandpaper, e.g. grit 400 or 600
A cotton swab and some rubbing alcohol or nail polish remover for cleaning

Step-by-Step Instructions

Step 1: Preparing the stem (drilling out)
If a part of the old, broken tenon is still inside the stem, it must first be drilled out.
Holding: Hold the stem securely or carefully clamp it in a vise with a soft cloth placed between the stem and the vise.
Drilling: Position the drill bit exactly in the center of the remaining old tenon. Drill slowly and without applying excessive pressure to remove the old tenon.
Checking: The hole is properly prepared when the structured (ridged) end of the new tenon fits exactly into it. The tenon should fit firmly without putting excessive pressure on the stem.

Step 2: Making the new tenon “grippy”
Teflon is very smooth, so adhesive does not adhere well to it on its own. Therefore, the bonding surface must be roughened.
Take the utility knife or file.
Roughen the ridged end of the tenon that will later disappear inside the stem thoroughly. There should be clearly visible rough scratches/notches/grooves.
Then thoroughly wipe away any resulting dust.

Step 3: Gluing
The tenon is now permanently attached to the stem.
Mixing the adhesive: Place equal parts of the two adhesive components on a piece of cardboard and mix them thoroughly, for example with a toothpick.
Applying: Apply a thin layer of adhesive to the roughened end of the tenon. Additionally, place a very small amount inside the prepared hole of the stem.
Joining: Carefully and straightly press the tenon into the stem.
Cleaning: If any adhesive squeezes out around the edge, carefully wipe it away immediately with a cloth and a suitable cleaning agent.
Allowing to cure: Lay the stem flat and leave the adhesive undisturbed for 24 hours to fully cure.

Step 4: Adjusting the tenon to the pipe (the most important step)
After 24 hours, the tenon should be fully cured. It is intentionally still slightly too thick for the mortise in your pipe.
Sanding: Wrap a small piece of fine sandpaper around the new tenon.
Turn the tenon back and forth against the sandpaper and sand evenly from all sides.
Testing: Carefully check from time to time whether the stem already fits into the pipe.
The goal: Continue sanding in small steps until the stem slides firmly but smoothly into the pipe without force.

Please work particularly carefully during all steps. There is a risk of damaging the stem, especially when drilling and adjusting the tenon.