My fingers. Worked.
Well, not literally, but it sorta felt like it, figuratively speaking.
I say that as though it was unpleasant to stitch it; it decidedly was not. Each repeat starts with a fresh new length of thread and then gets joined to the previous one. They go fairly quickly and because I made so many of them, by the time I got to the last ones I'd made so many improvements in the thread path that the only pain in the making was caused by the cursed Deadline.
It looks more intricate than it is which is always a plus: impress the hell out of the muggles with minimal effort but also I'm always charmed when the same skeleton can progress in a number of different ways so not only is there this crazy bangle but there are two versions of earrings you could make to match it. And the simpler earring motif could be joined rim-to-rim to make a bracelet or necklace too but I ran out of time. And also? I wanted to finish watching Season 3 of Broadchurch.
I'm not saying that you need no thread tension whatsoever, but my suspicion is that crazy tight may not be as vital as I like to say it is. ("These are hollow self-supporting beaded beads which rely in large part on thread tension to help them keep their shape so I suggest that you work at keeping your thread tension very firm"). I think that's pretty close to my usual beaded bead schpiel when I teach.