I'm trying to find a small cylinder tension Spring to use to add closing force on a helmet. I'm trying to make my 2 piece helmet pull itself closed. I need to pull it apart to get my head in and have the tension spring pull it closed. I'm hoping the spring is housed in a cylinder to not pinch my hair. It needs to be small enough to place in the helmet on each side. I keep finding what looks like opposing force cylinder springs which do the opposite, keep to object apart. Any help or links to the correct item needed would be greatly appreciated.