I do have to acknowledge comments by @pindac above about his vinyl journey. But more importantly it is about your enthusiasm for the La Platine, in particular, and your joy on full display with vinyl playing in general. It is infectious! I now feel guilty when not playing records.
Just when I thought all stones have been turned, you come up with this double loop idea. It seems counterintuitive at first. The logic was to reduce the contact area as much as possible while still maintaining speed. But the truth was the tiny silk thread was struggling to maintain speed especially on 45s’. And the additional loop really increase very little. It now looks like the thickness of the original linen thread. But the soundstage is more defined with better width / depth presentation. I have planar magnetic speakers. At low volume, the soundstage flattens. That has not changed. But at regular listening levels ( 75-80 db ), the soundstage is holographic. Because of the back and forth on this thread recently, I further refines my setup. The soundstage was improved already. But this takes it further, a very nice uptick.
The threads we use are regular sewing threads that we tie together. It is impossible to tie two loops with identical diameters. The first attempt at the double loop resulted in a very similar situation as @mr_gray. The loop was too small and the motor almost touched the plinth. I have a better managed distance between the two now.