How to permanently rotate an Entity?

Well, do you maybe know how to rotate permanently an Entity 360°?
Here’s an example:

“When you spawn on a map, you will see an SMG Round Box rotating and when you pick it up, it will show an Effect and it will be gone. After some time, it comes back and then you can pick it up again.”

When you can help me, I really would thank you!

PhysicsStimulate, pretty awesome for lua-beginners (“officially the most complicated callback in garry’s mod”)

Are you asking how to pick up an item and not have it reappear?