Had lighting / wiring problems on the oilhead a week ago, had to cut open the wiring harness to find a broken wire .
Just got some flexible plastic conduit from NAPA auto parts part number : 784681 for the .5 inch /13mm diameter .
They also had a larger diameter available, can't remember the diameter .
You can bend the conduit back on itself and it won't kink or open up .
Cost was under $5US for 6 feet / 1.8 m .

