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!

SEARCH
the Forums & Piano World

This custom search works much better than the built in one and allows searching older posts.
(ad 125) Sweetwater - Digital Keyboards & Other Gear
Digital Pianos at Sweetwater
(ad) Pearl River
Pearl River Pianos
(ad) Pianoteq
Latest Pianoteq add-on instrument: U4 upright piano
(ad) P B Guide
Acoustic & Digital Piano Guide
PianoSupplies.com (150)
Piano Accessories Music Related Gifts Piano Tuning Equipment Piano Moving Equipment
We now offer Gift Certificates in our online store!
(ad) Estonia Piano
Estonia Piano
Quick Links to Useful Stuff
Our Classified Ads
Find Piano Professionals-

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

Quick Links:
*Advertise On Piano World
*Free Piano Newsletter
*Online Piano Recitals
*Piano Recitals Index
*Piano Accessories
* 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
*Contest
*Links
*Virtual Piano
*Music Word Search
*Piano Screen Saver
*Piano Videos
*Virtual Piano Chords
Topic Options
#2043487 - 03/05/13 05:27 PM Grotrian grand lock
BEN120N Offline
Full Member

Registered: 02/12/12
Posts: 30
I regularly tune and maintain a Grotrian Steinweg concert grand.
The lock in the lid lock rail has failed. The finish is high gloss polyester and the lock is polished in. Can any one suggest how I can resolve this problem without damaging the finish.

Many thanks in anticipation,

Top
(ad PTG 568) Win a Year Journal Subscription
PTG 57th Annual Convention - Atlanta
#2043494 - 03/05/13 05:47 PM Re: Grotrian grand lock [Re: BEN120N]
BDB Online   content
Yikes! 10000 Post Club Member

Registered: 06/07/03
Posts: 21303
Loc: Oakland
Get them a cover with locking rings on it. That is the safest, most secure way of locking a piano.
_________________________
Semipro Tech

Top
#2043525 - 03/05/13 06:55 PM Re: Grotrian grand lock [Re: BEN120N]
Supply Offline
3000 Post Club Member

Registered: 09/11/06
Posts: 3919
Loc: Vancouver Island, BC, Canada
Removing a lock that is embedded in polyester requires special skill and probably a lot of luck as well. Conceivably one could sacrifice the finish on the rail and ref-finish the rail in gloss lacquer after replacement of the lock.

Otherwise, as mentioned, find a different way to secure the instrument. There is also a great retractable fallboard clamp style lock that I have access to in Europe. Contact me off-list if you are need more information.
_________________________
Jurgen Goering
Piano Forte Supply
www.pianofortesupply.com

Piattino Caster Cups distributor

Top
#2043771 - 03/06/13 05:53 AM Re: Grotrian grand lock [Re: BEN120N]
Olek Online   content
7000 Post Club Member

Registered: 03/14/08
Posts: 7262
Loc: France
I doubt the coat is thick above the lock, most often brass parts are laquered with a special lacquer, without acidity to avoid future tarnishing.

Small polyester cracks can be repaired and polished without laquering the whole part. (with Koenig repair kits ) It must be difficult to do that cleanly around a lock, however.

I cannot say there but the lock may be accessible from the underside

The Koenig polyester is usually an undercoat , but can be poiished to an almost invisible joint.

http://lakeoneusa.com/index.php/categories/konig-finish-repair

The problems are micro bubbles (heating lightly the resin , mixing it slowly in its can by turning it slowly, and allowing enough time for the air to escape after mixing the 2 composants helps well to avoid the bubbles)

Last problem is the amount of black dye. 2 to 4 drops is maximum, or the hardness is not enough, here again, the concentrated dye sold by Koenig does the job.

Water sand up to 2000-3000 grit (on foams for the last ones.

I have read that polyester primer have to be sanded without water, but I suppose it is only for the products used in automotive to close defects, they may content some powders and adbsorb water.

The repair poly is sending some parrafin at its surface. this one have to be cleaned before another coat is added.

Cleaning the side of the repair (cut in a dish shape to obtain invisible joint)with acetone helps me to avoid a greyish line. I suppose that polyester solvent would be better but I dont have it)


I would mail to the factory to ask advice (and let us know !)

Those sanding disks are invaluable :
http://lakeoneusa.com/index.php/products/abralon-sanding-disc-360



Edited by Olek (03/06/13 06:02 AM)
_________________________
Isaac OLEG - http://picasaweb.google.fr/PianoOleg pro

Top

Moderator:  Piano World 
What's Hot!!
Our latest Issue is available now...
Piano News - Interesting & Fun Piano Related Newsletter! (free)
-------------------
HOW TO POST PICTURES on the Piano Forums
-------------------
Sharing is Caring!
About the Buttons
-------------------
Forums Rules & Help
-------------------
ADVERTISE
on Piano World

The world's most popular piano web site.
(ad) HAILUN Pianos
Hailun Pianos - Click for More
Ad (Seiler/Knabe)
Knabe Pianos
Sheet Music
(PW is an affiliate)
Sheet Music Plus Featured Sale
(125ad) Dampp Chaser
Dampp Chaser Piano Life Saver
(ad) Lindeblad Piano
Lindeblad Piano Restoration
Who's Online
98 registered (accordeur, Atrys, Anticlock, ascc, Austin D, 24 invisible), 1315 Guests and 11 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
75602 Members
42 Forums
156326 Topics
2295878 Posts

Max Online: 15252 @ 03/21/10 11:39 PM
New Topics - Multiple Forums
piano technician cost list
by ascc
Today at 01:36 AM
Liszt on Steinway A3
by Reno
Today at 01:35 AM
Roland RD800 initial impressions
by fizikisto
Today at 12:28 AM
Connected Slurs
by TX-Bluebonnet
Today at 12:17 AM
Recital 35 --- Call For Submissions
by AB Forum Recital
Yesterday at 10:17 PM
(ads by Google)

Visit our online store for gifts for music lovers

 
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 - 2014 Piano World ® all rights reserved
No part of this site may be reproduced without prior written permission