[pianotech] adding weights

[David Boyce]

Dean, that was a considerable degree of technical expertise, and work, 
invested in a Wurlitzer console! I hope it was financially worthwhile. 
If it was, why would the owner spend the money on the Wurlitzer console 
instead of a new piano?!

Best regards,

David.
www.davidboyce.co.uk

>
> Subject was 30 year old Wurly console. Complaint was intermittent 
> sluggish keys.
>
> This was a multiple problem child. The presenting problem was jacks 
> not resetting. It had the nasty felt for the knuckles and backchecks 
> which contributed to excess friction on the jack. Then downweight was 
> in the low 40 gr range and upweight was less than 20. I find that that 
> kind of low upweight causes problems. It just isn't enough to get 
> things reset.
>
> I changed out knuckles and backchecks to Ecsaine to improve friction. 
> Then I added about a 10 gram weight into the back of the key and about 
> a 4 gram fishing line weight to the bridle strap wire. I also reduced 
> hammer spring tension slightly and damper spring tension until I was 
> measuring around 25g at damper head. Reducing these spring tensions 
> helped keep downweight from going up too much by adding the key/wippen 
> weights. The results were down weights around 50g and upweights in the 
> mid to upper 20g.
>>
>> I added a drop of thick CA after crimping the weight just for a 
>> little insurance.
>>
>> The improvement was huge. A very responsive action. This is the first 
>> one that I've done adding the keyweights and wippen weights.
>



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