Can't find awning part

[WobblyBob]

I have a new-to-me RV (technically Class C, but closer to a Class B in functionality). I have an awning on it that has trouble retracting. I can't find what kind of awning I have. I think it's a Carefree Freedom WM. I ordered a replacement drive head but it looks different. And I cannot figure out how to get my existing a drive head off. I tried the 3 screws and the nut but it doesn't come off. Please help! I'm at the end of my rope!

Pic of current drive head: https://photos.app.goo.gl/Xm72GbY2jQcpDEo67

The one I ordered: https://highskyrvparts.com/rv-parts/...ad-r062777-005