Clamp mechanism to hold the end caps on ???
I'm just assembling a 3 x 10 36 volt battery with the version 2 kit. To cut to the chase the springs push the cap away till there is little or no spring pressure holding the caps against the battery's. You can see this with one battery and cap, the orange cap on the positive end of the battery demonstrates this best. Press the cap onto the battery then slowly release the pressure. The cap pushes itself about 2 cm back which is enough to remove any significant spring pressure on the terminal. :(. Of my 30 batteries 4 in the pack made no contact at all. I used clamps to assemble the pack as shown in the YouTube video, 3 at a time. Very disappointed. It needs some way to clamp the caps, holding pressure on the connectors. I would never trust these connections in use. I think the springs in v2 are too strong.
Panasonic cells are known to be narrower than other 18650 cells, and are in fact not even 18 mm wide. For that reason, they sometimes don't fit as well in Vruzend caps. There are a few easy fixes for this that we've outlined here: https://vruzend.com/wrapping-panasonic-cells-to-ensure-a-strong-fit-in-vruzend-caps/
You may also want to consider sandwich plates: https://vruzend.com/adding-sandwich-plates-to-ensure-continuous-connections/