Paul from SWISCO responded:
January 6, 2017
Looks like the outer diameter of your white tube is 3/8". Can you confirm? If so, I recommend our Series 900 spiral balance.
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Tom from SWISCO responded:
January 18, 2017
It's just an older version. I don't think many manufacturers make these balances with plastic tubes anymore due to how easily they break. They get very brittle due to sun exposure, and in many cases end up cracking and falling apart long before the spring itself actually wears out. This is not a concern with modern metal-tubed balances.
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