A while back qwas posted about using 20 mm pipe on the mft. I bought some it readily available here but found them to loos fitting. I then tried several other things and found two that works best. The first is nylon connectors for 20mm for irrigation piping they fit tight in fact too tight but easily fixed by cutting a band saw kerf or two and plus the walls do not collapse or bend. The other thing that works great is 20 mm anchor bolt. You can tighten them and loosen them to remove great in jigs where you want to be sure nothing moves. We can make a plan in sending any over there if anybody is interested.