Foreword: it isn't obvious in the context — this cable is to used in the car, hooked up to car amplifier RCA cable, so it's thickness isn't a big deal.
After last time I split cable apart and soldered back together, it lasted a couple of days only if that. So I ordered a new one and opened up old one again. Changed a bit how I do old one and keep brand new two dollar one as a backup.

. I used 




