New WNG carbon fiber action parts

[Mike Spalding]

Jude,

Main problems are:  1)  Wippen rail needs to be relieved to clear 
bottome of wippen, otherwise the rail holds the wippen up off of the 
capstain.  2)  The Wippen has a cast-in boss for assist springs, which 
interferes with the hammer tail.  We'll have to cut off the spring 
boss.  They suggested coving out the hammer a little more, but we'd 
rather have reliable checking.  3)  Let-off button adjustment will be 
nearly bottomed out - we'll need to replace with longer buttons.  4)  
Drop screws will be turned down so low they'll be buried - we'll have to 
install thicker cushion on the rep lever.  As to the suggestion to check 
the action spread, can't increase it because of the spring boss - hammer 
tail interference, and can't decrease it or the jack tender will be off 
the edge of the let-off button.  I'll try to find the photos.  We've 
test regulated samples of black WNG, new Renner, and the original WNG parts
in all possible combinations, and the black WNG wippens cause problems 
in any combination, while the original WNG wippens work best and the 
Renner wippens are acceptable.

Mike

Jude Reveley/Absolute Piano wrote:
> Hi Mike,
>
> I've successfully installed the WNG parts on my M&H A 29783 (1921). 
> What sort of issues are you having? Any pictures?
>
> Jude Reveley, RPT
> Absolute Piano Restoration, LLC
> Lowell, Massachusetts
> (978) 323-4545
>
> ----- Original Message ----- From: "Mike Spalding" 
> <mike.spalding1 at verizon.net>
> To: "Pianotech" <pianotech at ptg.org>
> Sent: Friday, October 10, 2008 9:32 PM
> Subject: New WNG carbon fiber action parts
>
>
>> List,
>>
>> Has anybody out there successfully installed a set of the new black 
>> plastic WNG shanks and wips in an older M&H action?  We've obtained a 
>> set of these parts for a 1920's vintage A, and it appears we must 
>> make significant alterations to the wippens, and to the wippen rail, 
>> in order to make these parts work.  Response from WNG hasn't solved 
>> any of the problems ("check the action spread" - like the tech help 
>> guy whose first response to any problem is to tell you to reboot your 
>> computer)  Thought I'd check with the larger community to see if our 
>> experience is unique, or if anybody has some constructive advice...
>>
>> thanks
>>
>> Mike
>>
>>
>
>