making the first person character hold object, when interacted

i have a normal first person character without a mesh.

i copied the springarm from the one from the flashlight, so it would have a little lag while looking around.

now i got a result, after i changed something. my character is now “holding” the item, but it doesnt shake a little bit, so it looks awful. is there a way to use a similair function like the camera shake function?