HI David ,
I use use 3 core twin and earth cable when striped about 1mm.
cut of 1mtr length , fix one end in vice , the other end in chuck on drill .
pull till taught switch on drill and pull back gently , Walla
a nice tensioned piece of hand rail .
tread though stantions a dab s/g , then paint as Bob advised ,……..
cheers Larry….