Hey guys i just bought used supertech dual valve springs and i just wanted your opinions. they look good to the eyes but i dont know if there is a way for me to test them or find out if they are in working order? is it ok if the inner spring moves on some and not the other? i feel like this doesnt matter because they will be compressed but i just wanted to make sure. also if there is a test i can do to test their spring strength? thanks for any help you can give me