Here is a picture.
View attachment 246969
Basically because of the length of the ferrule and size of the hole, you can't get the wavy element through the hole without straightening which I tried without luck. It felt like I was going to break it,
I'm wondering the same thing looks like some people can and some can't get it through the same ferule. I just posted this on another thread asking what element it is. Maybe different to yours?
https://www.homebrewtalk.com/f170/weldless-triclover-element-428247/index21.html