[CAUT] Original SD-10 Key Height

[Fred Sturm]

Back to this original question, and the reason for wanting to know the  
original spec: balance pins too low in the mortises. I assume the tops  
are not (or not all) protruding? I guess my own response would be to  
address the pins, not fool around with adjusting everything around  
where they happen to be. Lowering key height enough to make the tops  
of the pins protrude seems like a heck of a lot of lowering. What does  
that do to other issues, like having enough dip, relationship of  
keytops with fallboard, actually having punchings under the balance  
holes to be able to level the keys?
	In any case, why not just raise the pins a bit (pry or drive them up  
a couple mm)? Maybe somebody pounded them down for some reason. Or  
replace with longer ones if that is necessary. Or if "almost buried"  
just means borderline, the curved part is just over the tops of the  
bushings, leave well enough alone.
Regards,
Fred Sturm
University of New Mexico
fssturm at unm.edu



On Jul 4, 2009, at 12:56 PM, Bob Hull wrote:

>
> Rebuilding the action of an SD 10 and it appears that someone has  
> already been monkeying with this one.  The balance rail pins are  
> almost buried in the mortise.  The key ht. on the old action is 2  
> 3/4" to the underside of the keytop.   Does someone know what the  
> original specs were?   The piano action handbook says 2 9/16" for  
> Baldwin concert grand but I didn't know if the SD10 would be  
> different than a generic older  Baldwin concert grand.
>
> Also, original specs for hammer blow and dip if you know.  I'll make  
> my adjustments from there.
>
>
> Thanks.
>
> Bob
>
>
>