The Le^el Audio PSB (pure silver bridges) are solid silver square conductors of 2mm2 and therefor offer a larger contact surface area than round conductors.
By using these solid silver bridges the sound image will drastically improve compared to the thin and weak bridges made of guilded metal or brass. These connections are eventually able to handle sufficient current but due to a high contact resistance, a loss of detail and spatial imaging will occur.
Fastening tightly (but not too tight) by hand should suffice. Retightening after a while is advisable. (Sometimes they loosen due to vibrations)
FROM OWN EXPERIENCES.......JUST DO IT AND ENJOY WITH A SMILE! A real supertweak!