NuPrime balance holders are "stuck"

A quick learner from Carmel, NY says:
I am trying to make adjustments to some NuPrime single hung windows. In the window channels where the bottom removable sash nestle the two lugs into a cup like holder attached by cord to the window balance. Many years have made these holders "stuck" such that they do not readily move with the sash. What is the recommended lubricant to free up? Thanks for any advice.
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Paul from SWISCO responded:
We may be able to help, yes. Could you show me some pictures of the window and balances? That would help us come up with a possible solution.
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