Broken top sash guides. Do I need new balances?

A home owner from Jacksonville, FL says:
October 2, 2011
I need to replace a bunch of 18-166 Kimco Top Sash Guides. The channel balances them selves look okay, but since they have broken the top sash guides, do I need to replace the channel balances too or can I just lubricate them somehow to prevent busting again in the future?
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Paul from SWISCO responded:
October 3, 2011
If balances still work, just replace top sash guides (18-166). The top guides might have broken from fatigue.
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