Just my 2 cents, I would not use a hair dryer. You could heat up arm pivot lubrication and cause possible damage.
Just do as Mofimadness recommended in his post. Exercise the arm lift. You can do so by gently using your fingers on the lift itself.
Just do as Mofimadness recommended in his post. Exercise the arm lift. You can do so by gently using your fingers on the lift itself.