In my experience, disconnecting a Master-Link while the chain is under [proper] tension is almost impossible. Your tensioners may work well for derailer bikes, but not for SS/FG. It's great that they screw out, but they shouldn't be there in the first place. We appreciate your input, but you should trust the collected wisdom of the people on this board, some of whom are very knowledgeable, accomplished cyclists...whose bread-and-butter are fixed drivetrain bikes. (Note, I'm not necessarily including myself in that category.)