Parts Decision

[Newton Hunt]

Avery,

The smaller the difference between up and down weights the lower the
friction.  The average of the two, 50 and 30, is 40 grams, a very
desirable balance weight.

The weight of the parts is less important than the weights from pivot to
contact points.

How much lead is in the keys, in grams from pivot to 1 cm from the front
of the key?

		Newton

Avery Todd wrote:
> 
> List,
> 
> Well, I got the Ronsens in the other day and have been trying
> to figure out the right combination of parts for the action of
> this Steinway M (1925).
> 
> For those who've used the Renner parts kit and might be
> familiar with the parts numbers, what seems to come closet to
> app. 50 g. downweight (note #27) is the #913 041 straight heel
> wippen and #913 031 shank/flange. That is the 17mm shank but
> as near as I can tell, this would probably work best and
> require minimal leading. The next shank down, #913 029
> (16.2 mm ?) also comes very close.
> 
> The upweight is a little high though, closer to 30 than 25.
> 
> Out of curiosity, I just weighed all the old and new parts.
> The old shank/flange/hammer assembly was 13.5 grams. The new
> was 15.8g. The new hammer (#27) was 8.7g. I didn't pop the
> old one to compare it.
> 
> The old wippen weighed 20.5g and the new, 22.1g. This action
> has a good bit of verdigris, so it's kind of hard to compare
> the new with the old.
> 
> This is the first time I've used the parts kit, so any advice
> you can give me from what I've said above will be more than
> welcome. I'd like to order the parts tomorrow. Thanks.
> 
> Regards,
> Avery