Hi guys!
Thank you for your comments!
Richard, this is not a brass tube, it's a plastic tube made from stretched cotton buds and painted with a gunze's metalizers:) Here's shown the whole process step by step:
http://www.pwm.org.pl/viewtopic.php?f=10&t=230in my turnbuckles, fishing line I replaced the thin cooper wire
Best greetings!
Tomek