A8 PTFE Guide Tube Mount

No

.3

I used 3x 0.45mm walls and 5x 0.3mm top/bottoms (~1.4mm thick shell). You need the extra meat to tap the threads.

You don't need to go out and buy a blind tap, just order an extra tube fitting if you don't already have one on hand. The spare fitting can easily be modified with a dremel cutoff disc to make the perfect tap for the threads. Just cut 2 or 3 evenly spaced slots perpendicular to the threads. Don't cut all the way through, but deep enough to cut the full thread pattern plus a little room for chip clearance. Try to finesse the dremel to get ~90degrees rake angle on the cutting edge if your makeshift tap isn't cutting clean. A 10mm socket driver also helps hold holds it straight (the tapered hole makes it even easier). I use this method all the time when I have to cut a thread in plastic but don't have a tap of the correct size on hand. This tiny blind taper threaded hole is a perfect application. Don't forget to put this little gem in your tap storage box when done. ;)