[Help] How to make an item play a animation once you hit anything with it

i was making a weapon additional mod for better combat, and i made a nunchuck, but instead of being a blank item i decided to make it animated but only once you hit something with it so it doesn't look stiff, but problem is, i sorta just can't figure out how to do that, i tried 2 times already and both ways kind of just failed, so if anyone can help me figure out a way to do this, id be thankful