Spiral sash Balance's.

G'Day. I am new to this forum, I am replacing all the glass in my sash windows with double gazing, the current sash balances are from Gainsborough, and some balances need replacing. the cost per double hung window is $122.20. I reckon this is way to much, I need to support 15.5 Kg per window, Whitco do not support this weight. I have a possible 50% replacement of balance's over 18 windows.
Any suggestions out there. I have heard of a third company in Melbourne but no joy on Google.:o


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