First, I have to say Bob is THE MAN, IMO. It does work, but I found that the size of the tenon is critical to the actual tenon threader used. I have tried the Atlas one, Porper one, and now have the Hightower brass one. I have found that what works for me is cutting the tenon a tad smaller than they state, and also using beeswax works the best, as Bob showed. I have twisted off tenons and in 2 cases it was because I didn't let go fast enough but most were due to the tenon size being a bit too large. I now use .277". When the first time that happened, I used a drill to remove the wood and it damaged the threader beyond repair....my bad. Also, the type of wood being done makes a difference too, like Ramin wood or ash will not thread the same as maple, with these I usually soak the tenon with thin CA first, then take the finish pass again at the same size...makes better threads..