@ozzy Can you tell and show us what you used to make your own HFT's? I read about 'copper pipe caps with a copper cone inside'.
So far I have found this: https://goo.gl/Px4bjU for the copper caps
Is this OK - and how do the copper cones look like to put inside?
So far I have found this: https://goo.gl/Px4bjU for the copper caps
Is this OK - and how do the copper cones look like to put inside?