Unstable regulation

[greg hollister]

I have been tuning a mid-sized Young Chang grand for a
serious client for several years now. Each time I go
to tune it I find the hammers blocking at the strings.
I'll turn down the let-off dowels to some degree of
let-off to get me through the tuning. But each year I
go back to her house the condition is the same, the
hammers are blocking again.  I want to regulate this
piano as it should be but I am concerned that I will
be frustrated by whatever it is that causes the return
of this blocking condition. 
Does this sound familiar to anyone? Could this be a
loose let-off rail? I have marked the capstans to see
if they were turning on their own and they don't
appear to be.







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