replacement balance

A handy person from kissimmee fl says:
want to replace balances on original 51"wide tilt window.
the old balance weighs 7.5oz. barrel is 30"long. color of tip is white. the end has two pins spaced .5" apart.
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Tom from SWISCO responded:
Thanks for posting. Sounds like you have a spiral balance. Before I recommend a replacement, can you tell me what the diameter of the tube is? Can you also tell me the weight of the sash?
A quick learner from kissimmee fl says:
the tube on the balance is 3/8" and the weight of the sash is 31 lbs.
Also do you carry the snap in stop for the top of the rail.
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Tom from SWISCO responded:
Thanks! I would recommend our S900-30 with a Yellow Tip strength option. I'm afraid we do not carry the sash stop you need, however.
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