Well I am glad to see the discussion ongoing. I am back on my feet but pretty weak at present. I don't have full use of the fingers of my left hand & I am a strong lefty, never mind what 19 days lying on your back does to your body, when you get out of bed you forget you have legs.Now about the joint that Dave has so kindly put up pictures of. It is a true C/V joint as it has 360 degree movement in any direction which a U/Joint does not. A single Huco will only act in one plane hence the need for to double the joint. If you don't & the Huco has the Slightest Misalignment it will have a tight spot in EVERY single rotation & I doubt that the vast majority of us get our motor/shaft alignments 100%.This has been an ongoing discussion for a long time. I am fairly new to boats but have over 50 years in the auto industry & 2 years of engineering school. One has only to look at the propshaft on any rear wheel drive car to see that they use TWO U/joints in the shaft & they also have to be aligned or what some call phased or they will bind at some point. I see many beautiful models on the forum using a single Huco & I will tell you now that if it is not a 100% in alignment it will be binding at some point of its rotation.This will cause power loss & vibration & the only way to cure it is a double joint. We do have the Dumas dog bone joint of course & the plastic sleeve units as well. As you will see from the tests done by John (oldiron) the Dumas was the best one of the ones he tested.The joint that I found in my search is made by a US company,HPI Racing in California. I tried to talk to their R&D department about having copies of the one I modified made but no joy they would not even put my call through,too busy they said. I have a lathe so I used that to do the mods. One end has to be drilled to fit the motor shaft.The long shaft that goes to the wheel I cut off at about 1 inch & threaded it 4MM. I then made a sleeve out of brass & threaded it internally 4Mm as well. the sleeve will now attach to a 4MM drive/propshaft. If your propshaft is 3 or 5 MM you will have to thread one end of the brass sleeve to match the propshaft. This is well within the skills of most of the guys on this forum, but if you want one made I will do one for you at cost including the joint & sleeve which is about $25. As for the question of weight it weighs 23/25 grams depending on the length of the sleeve. It is also very strong & better yet you can buy a repair kit for it as well for just $8. All I can say in conclusion you will not find any other joint on my boats unless the one of my own design proves better & which is still being developed (3rd prototype at present)As you know I had a slight delay. One of the factors that pushed me into buying a milling machine was in the quest for a better joint & I could not make it accurate enough free hand. If you have questions or want more information PM me, I may be slow in answering but I will try to answer all.Mick B.