Hello,
I have a Linhof Technika IV and I would like to change the bent tilt lock lever on the front standard. How can I take it off?

When I unscrew, the screw gets a little play but I cannot unscrew more

Here is the faulty lever :
Click image for larger version.  Name: 20210904_184149.jpg  Views: 30  Size: 60.3 KB  ID: 220347

Thank a lot for any tip