Paul from SWISCO responded:
September 26, 2017
Great question! People have replaced the coil spring set-up with a spiral balance and pivot shoe. The only issue is that the metal tube will be exposed when the lower sash is in the closed position.
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Paul from SWISCO responded:
September 28, 2017
Are you referring to the tube attached to the balance itself? I'm afraid these cannot be replaced. All of our balances have metal tubes.
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