ok thanks for the quick reply. I will try one of the old RCA cables 
Just the word of advice: don’t keep the iron on PCB more than 2-3 seconds. If the joint is not working out to your liking, give it a chance to chill and try again. If the traces start to peel because of PCB overheating it’s going to be hard to fix.
I’d also do a knot with the wire through the hole in the corner of the PCB to prevent casualties on the board if somebody yanks on the other end of the wire.