springs not strong enough

A professional from mempjis says:
I ordered 4 green tip 29" 306 spiral balances and they aren't strong enough do yall have any stronger balances and how do I return the ones I have that I ahvent used
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Tom from SWISCO responded:

I'm afraid Green is the strongest color option we have for this size. What is the exact weight of your sash? Could you also show us some photos of your old balance?

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