Welcome to the Piano World Piano Forums
Over 2 million posts about pianos, digital pianos, and all types of keyboard instruments
Join the World's Largest Community of Piano Lovers (it's free)
It's Fun to Play the Piano ... Please Pass It On!

Gifts and supplies for the musician

Piano Acc. & Gift Items in
Piano World's Online Store
In PianoSupplies.com ,(a division of Piano World) our online store for piano and music gifts and accessories, party goods, tuning equipment, piano moving equipment, benches, lamps and more.

Free Shipping on Jansen Artist Piano Benches
(ad) Pianoteq
(ad) Pearl River
Pearl River Pianos
(ad) P B Guide
Acoustic & Digital Piano Guide
Who's Online
111 registered (AndrewJCW, AmandaH, anotherscott, Alagondar, Andrei Kuznetsov, 24 invisible), 1428 Guests and 6 Spiders online.
Key: Admin, Global Mod, Mod
(ad) Estonia Piano
Estonia Pianos
Quick Links to Useful Piano & Music Resources
Our Classified Ads
Find Piano Professionals-

*Piano Dealers - Piano Stores
*Piano Tuners
*Piano Teachers
*Piano Movers
*Piano Restorations
*Piano Manufacturers

Quick Links:
*Advertise On Piano World
*Free Piano Newsletter
*Online Piano Recitals
*Piano Recitals Index
*Piano & Music Accessories
*Live Piano Venues
*Music School Listings
* Buying a Piano
*Buying A Acoustic Piano
*Buying a Digital Piano
*Pianos for Sale
*Sell Your Piano
*How Old is My Piano?
*Piano Books
*Piano Art, Pictures, & Posters
*Directory/Site Map
*Virtual Piano
*Music Word Search
*Piano Screen Saver
*Piano Videos
*Virtual Piano Chords
Topic Options
#2045187 - 03/08/13 05:14 PM Steinway sostenuto
BEN120N Offline
Full Member

Registered: 02/12/12
Posts: 33
A Steinway D grand that I tune regularly has a noticeable knock when the sostenuto pedal is pressed. Two Steinway technicians who service the piano have denied its existence. Any ideas?

(ad 568) PTG Journal Online
PTG Journal Online
#2045214 - 03/08/13 06:15 PM Re: Steinway sostenuto [Re: BEN120N]
Gene Nelson Offline
1000 Post Club Member

Registered: 09/10/04
Posts: 1735
Loc: Old Hangtown California
Check the rod mounting brackets for missing or damaged bushings.
Or look at or feel the damper blocks to see if any are being bumped when the rod rotates.
PTG Member

#2045221 - 03/08/13 06:23 PM Re: Steinway sostenuto [Re: BEN120N]
Ed Foote Offline
1000 Post Club Member

Registered: 05/03/03
Posts: 1476
Loc: Tennessee
I would agree, if the knock is heard as you depress the pedal, with no keys touched,and you hear a knock, there is a damper tab that is being grazed by the sos. blade, or,the blade could be catching the edge of the back check on the the very ends of the rod.

If there are a couple of tabs being grazed, and they are adustable, papering them down will remedy the problem. That assumes the underlevers are hanging at the right height. It might be loose bushings in the rod brackets, it could be something in the trap work.
Good luck,

#2045237 - 03/08/13 07:08 PM Re: Steinway sostenuto [Re: BEN120N]
kpembrook Online   content
1000 Post Club Member

Registered: 04/06/10
Posts: 1460
Loc: Michigan
Originally Posted By: BEN120N
A Steinway D grand that I tune regularly has a noticeable knock when the sostenuto pedal is pressed. Two Steinway technicians who service the piano have denied its existence. Any ideas?

Possibly a keyframe bedding problem. When the pedal is depressed the keybed can flex downward, creating a gap between the glider bolts and the keybed.
Keith Akins, RPT
Editor, Piano Technicians Journal
USA Distributor for Isaac Cadenza hammers and Profundo Bass Strings
Supporting Piano Owners D-I-Y piano tuning and repair

#2055766 - 03/28/13 04:09 PM Re: Steinway sostenuto [Re: Gene Nelson]
BEN120N Offline
Full Member

Registered: 02/12/12
Posts: 33
Re. Steinway sostenuto knock.

Thanks for all the advice. I've been to the piano today. After having been sure in the past the rail was not catching any lips, today one was jumping up.

Having adjusted the rail to stop this, the knock has gone!

I feel a bit dim not to have realised the rail could knock without visual signs.

The day you stop learning something is the day to do something else!

Thanks again.

Ben Nolan


Moderator:  Piano World 
the Forums & Piano World

Trying Something New with Search
(ad) Yamaha CP4 or CP40 Free Bag
Buy a CP4 or CP40 Get a Free Bag
(ad 125) Sweetwater - Digital Keyboards & Other Gear
Digital Pianos at Sweetwater
(ads) PD - WNG - MH
Wessell Nickel & Gross
Ad (the Piano Store)
the Piano Store - Restored Steinway Pianos
(125ad) Dampp Chaser
Dampp Chaser Piano Life Saver
New Topics - Multiple Forums
Music rack extension?
by FrankCox
11/30/15 10:33 PM
Missing Something
by Sovrel
11/30/15 10:05 PM
Advice on a New Kawai GX-2
by roninpro
11/30/15 09:28 PM
Beginner Study - 'Galop' D. Kabalevsky, Op. 39
by AndrewJCW
11/30/15 07:11 PM
Galaxy Vintage D: Occasional Pop/Hiss
by newbert
11/30/15 07:11 PM
What's Hot!!
Posting Pictures on the Forums
Forums Rules & Help
on Piano World

The world's most popular piano web site.
Forum Stats
81,614 Registered Members
44 Forums
168,704 Topics
2,471,332 Posts

Most users ever online: 15,252 @ 03/21/10 11:39 PM

Visit our online store for gifts for music lovers

Help keep the forums up and running with a donation, any amount is appreciated!
Or by becoming a Subscribing member! Thank-you.
Donate   Subscribe
Our Piano Related Classified Ads
Dealers | Tuners | Lessons | Movers | Restorations | Pianos For Sale | Sell Your Piano |

Advertise on Piano World
| Subscribe | Piano World | PianoSupplies.com | Advertise on Piano World | Donate | Link to Us | Classifieds |
| |Contact | Privacy | Legal | About Us | Site Map | Free Newsletter | Press Room |

copyright 1997 - 2015 Piano World ® all rights reserved
No part of this site may be reproduced without prior written permission