Those dubbing twisters look nice, but they don't address the issue that this Swiss tool tries to solve, controlling the loop for dubbing insertion before the twisting starts. This is where I often have some frustration getting material into the loop and then closing the loop before starting the spin. The video shows how those slots and holes in the Swiss tool can be used to smoothly control the loop opening. I can't see paying the asking price for this tool, but I may try to make one to see if it makes loop control any easier.
Ted