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
SEARCH
the Forums & Piano World

This custom search works much better than the built in one and allows searching older posts.
(ad) Yamaha CP4 Rebate
Yamaha CP4 Rebate
(ad 125) Sweetwater - Digital Keyboards & Other Gear
Digital Pianos at Sweetwater
(ad) Pianoteq
(ad) Pearl River
Pearl River Pianos
(ad) P B Guide
Acoustic & Digital Piano Guide
Who's Online
103 registered (ando, Anita Potter, Anne'sson, AndyP, alexk3954, 29 invisible), 1148 Guests and 11 Spiders online.
Key: Admin, Global Mod, Mod
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
*Organs

Quick Links:
*Advertise On Piano World
*Free Piano Newsletter
*Online Piano Recitals
*Piano Recitals Index
*Piano & Music Accessories
*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
*Contest
*Links
*Virtual Piano
*Music Word Search
*Piano Screen Saver
*Piano Videos
*Virtual Piano Chords
(ad) Estonia Piano
Estonia Pianos
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 757) The Value of PTG Membership
The Value of a PTG Membership
#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: 22176
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 Offline
7000 Post Club Member

Registered: 03/14/08
Posts: 7904
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)
_________________________
It is critical that you call your Senators and Representatives and ask them to cosponsor S. 2587 and H.R. 5052. Getting your legislators to cosponsor these bills


Top

Moderator:  Piano World 
What's Hot!!
The February 2015 Issue of our Free Piano News Newsletter is out now! FREE Piano Newsletter
--------------------
The best thing I've learned on Piano World....
-------------------
Posting Pictures on the Forums
-------------------
Forums Rules & Help
-------------------
ADVERTISE
on Piano World

The world's most popular piano web site.
-------------------
PIANO BOOKS
(ad) Jazz Piano Online
Jazz Piano Online Lessons
Ad (Seiler/Knabe)
Knabe Pianos
(125ad) Dampp Chaser
Dampp Chaser Piano Life Saver
(ad) Lindeblad Piano
Lindeblad Piano Restoration
New Topics - Multiple Forums
ES8 Wishlist over my ES7
by jim tulloch
02/28/15 11:26 PM
IvoryII hardware questions
by B3boy
02/28/15 10:50 PM
Anybody know this piece?
by wr
02/28/15 10:17 PM
Let's talk about some music
by Polyphonist
02/28/15 09:44 PM
Glenn Gould talks about J S Bach
by pianoman9
02/28/15 09:05 PM
Forum Stats
78,337 Registered Members
43 Forums
161,935 Topics
2,378,069 Posts

Most users ever online: 15,252 @ 03/21/10 11:39 PM
Gift Ideas for Music Lovers!
Find the Perfect Gift for the Music Lovers on your List!
Visit our online store today.

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