Just wanted to share here that the SMA to U.FL cables from this supplier work very well, at least with V4 Miniscopes:
After I encountered some sudden problems with our self soldered cables (which worked before) and reading through the many postings here that report serious damage to miniscopes from broken cables etc. we looked for cables to purchase and decided to give it a shot. Also,
if we built the cables ourselves
the stuff from cooner wires plus the connectors are actually more expensive, at least here in Australia.
Importantly, the 1.13mm diameter makes the cable flexible enough to allow mice free movement, but stringent enough to make our dragonfly commutator move, which was not the case with the cooner wire.