Please Help Me with this Problem (Mace and Spear)

I recently had an idea. I’ve wanted to put it into practice for a long time. But for some reason, I just can’t seem to make it work, and I don’t understand why they haven’t done it yet. I’m talking about the Mace and the Spear. I really want to create a better version of both of these items. And I think it’s a real shame that these items aren’t available in Mcreator and that you can only make them using this block procedure. But does anyone happen to know how to do this, or does anyone already have a workspace or something? Because if so, that would be really helpful. It would be cool if someone could share their workspace with these two items. That would help me out a ton, and I’d be really grateful. For now, I just want to implement the vanilla mechanics, and I still don’t quite get this stuff with the procedures yet.