1 and 2.5
Normally no trouble with the coppers, but because temps are so deep I have been running my 2.5 back 300+ and when it pops it has a tendency to catch the copper.
Jack from Echo One gave us some bells to try after watching the videos of us not paying attention...
Put them on, turned around and said man they are loud, turn back around to see a rod bouncing lol... guess they work!