Help: Cutlass RS HSS Truss Rod Is Stuck

I hope you are all well. Happy new year as well. I think I’ve got a problem with the truss rod on my cutlass RS HSS.

I think it might have seized up and got stuck. I’ve tried to adjust it just a small amount and it moves ever so slightly clockwise and counterclockwise about half a turn but if I want to try and move it more than that it won’t budge. I didn’t want to force it. It feels like I’m gonna break my Allen key if I try and move it anymore.

Have you guys had this before?

Any ideas what to try? Do you think it needs looking at?

Many thanks

Paul