Selecting the Correct Action Parts When Restoring a Vintage Piano
The key factor in selecting correct replacement parts is to insure
that the original action dimensions and relationships won't change
upon installation. To accomplish this, Renner maintains a century old
manufacturing database with master action designs from which it can
produce genuine Renner action parts with the same "original dimensions" as
were used in the original piano manufacture.
There is only one set of relationships through which the mechanism
will operate properly, and you will find those relationships carefully
engineered and built into every Renner part. The objective, simply
stated, is to protect the authentic design of the piano and to carefully
restore it to the original intent of then piano maker.