singer sewing 91k5 looper replacement

[ddiuni]

Has anyone tried replacing the 91k5's looper?

I looked at the installed looper and it was not just plugged in.
When I looked at the part where it was plugged in, it looks like it was fixed with solder or something.
The looper cannot move while rotating, so I think it was fixed with a solder lamp.

To disassemble this and put a new looper on, you have to remove the lead...
It doesn't seem easy.
I'm asking if anyone has removed it.

[ddiuni]

I set the soldering machine to 400 degrees and scraped it off with a sharp object, and it was still lead.
It seems that the lead has been removed, but the looper is still not removable.