I haven’t been switching plugs, attached the 3.5mm and kept that on. I’m over 4.4bal for iems.I should have picked this up when you mentioned it to me. They aren't screw on, theres a little guide that ensures it fits a particular orientation. Hopefully that's still there if you've been screwing lol...
It’s a shame it’s not screw secured, really should be. I’ll order in fixed 3.5 when I eventually order my own unit (ear hooks too). I know there’s no option for that on the website, but penon are usually very accommodating with requests.