Disassemble my kick start

[Sekenra]

Hi, i'm new here and I'm working on a Tomos Yougst'r (2012). I'm trying to unscrew the nut to take off the kick start but I'm stuck because it doesn't move. I tried to pull the thread stick out. Did I missed something ? Can I make a stronger impact with myy hammer without making a mistake?

Scew I can't take off

[fons716]

Press a heavy hammer under the kickstarter.
Turn the nut a bit on the thread stick, then the thread will remain intact when you hit it with a second hammer.