Pin flexing/bending/twisting

[Ron Nossaman]

> Has anyone done a study of the negative effects that occur to a tuning 
> pin or the pinblock while tuning? I service a new-ish 7' Bosendorfer for 
> a Boeing engineer, who is a hobbist with older uprights and we've been 
> discussing the rigors the pin endures while being twisted and flexed, 
> and also the affect on the pinblock.
>  
> Dave Davis, RPT
> Renton, WA

Depends on what you mean by a "study". Sans committee, the 
effect on the pin will be inconsequential, and the effect on 
the block will be nearly so. By far, the greatest damage to 
the pinblock (not done at instillation) occurs with humidity 
swings over time.
Ron N