I do a lot of pianos at the university where all I replace are the top two sections of strings, the capo sections. After 20 - 30 years there are likely to be issues, either rending friction or noise, and restringing just these sections gives the biggest bang for the buck in terms of improvement. I pull bridge pins (can't reach a unison next to each strut, but all the rest). Then I make the bridge top flat, with a combination of cabinet scraper and sandpaper. I use a single finger sanding technique, putting the pressure on the middle of the bridge and watching progress until the grooves in the bridge top are close to disappearing. Put a straightedge (6" rule) on the surface to make sure you are staying flat, and adjust what you do accordingly. I have used sanding blocks, and have found that I tend to end up with a convex surface. The hand isn't steady enough over a narrow surface like a bridge. You could use a small piece of 1x2 with the sandpaper pulled over the narrow edge as a block if this seemed easier to you. I have found the finger method works fine for me.
Then I renotch as needed, and put new pins in, inserting thin CA into each hole before pounding in the pins. I put CA in maybe 3 to 4 unisons at a time, pound, repeat. Use a punch that is a thin steel rod with a hole drilled in it large enough to fit the pin, and deep enough to serve as a gauge: stop pounding when the punch meets the surface. I used to use epoxy, then thick CA. I found in going back years later that it was VERY difficult to remove those pins (heat helps, but still . . .) Thin CA is a weaker bond, and it serves the purpose well enough, filling the gap and making it less hygroscopic.
Bill Spurlock (I think) wrote a series on this process many years back, with epoxy as his material. It is always worth reading what Bill had to say.
I agree with Ron N. about "seating strings" (there is plenty of conversation along those lines in the archives, including this
recent thread (though the topic is "string lifter" the conversation got into manipulating wires at terminations). Also, search "seating strings" and related topics.
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Fred Sturm
University of New Mexico
fssturm@unm.edu http://fredsturm.net "When I smell a flower, I don't think about how it was cultivated. I like to listen to music the same way." -Federico Mompou
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Original Message:
Sent: 08-28-2013 06:04
From: David Pritchard
Subject: Re-stringing a piano
Thanks for all the good advise, everyone.
I'll clarify my situation and intentions a bit in case you want to add anything else.
I have been a piano technician full-time for 14 years in the panhandle of Nebraska. Just sold my piano tech business in May and moved to Lynchburg, Virginia to pursue convincing Liberty University that they need to hire a full-time on staff tech. I had put that bug in the Dean of the school of music's ear back in February. Made the move and made a concerted effort at showing them that I would be a good tech for the University. They had been using 2 other techs that were basically just tuning the pianos and minor repairs. Not much beyond that. I was able to show them how much their pianos could benefit from regulation, voicing, etc.
2 weeks ago they gave the entire contract to me, so I am their sole tech. It is not an on-staff position yet, since they set this year's budget way back last November, but I think they are interested in making me a staff tech as early as next year. I'm excited about the possibilities as they are just breaking ground on a new 30 Million dollar music and performing arts center that should be completed within 2 years. It will be state of the art and have about 100 pianos in it.
They currently have 79 pianos which I have been tuning for the past 2 weeks. Will finish up tomorrow. Since I am basically working within last years tuning budget, there really isn't money currently set aside for full grand regulations, etc. but they are wanting me to put together a "bid" of the things I feel are most important to get some of their better quality instruments working up to their potential. They will go to the provost and request a budget addendum for everything I ask for and they think there is a good chance they can get the money if we structure it right. I think the idea is to then show them how much value they would get in the future by having me on staff rather than contracting me for every little job.
The Kawai Grand that I want to suggest re-stringing is in pretty decent shape, but there are a lot of false beats in the treble and the bass string are somewhat dead sounding. I seated all the strings before I tuned it, but still had false beats and the top octave was very hard to tune. There is crown and down bearing, but the strings actually have a lot of discoloration and rust, etc. The action is in pretty decent shape, but I will suggest a full regulation as well if they can get the funds.
I have put whole sets of bass strings on a piano twice, but in both cases it was on uprights. I have replaced many, many individual bass strings, and many broken plain wire strings, just never a whole piano's worth at once. I am confident in my ability to put the strings on and make the coils, etc, especially if I use the old tuning pins.
I did recently purchase a jack for supporting the pin block - I just have never used it yet.
If I did the re-stringing job on this piano, I would do it starting right at the beginning of Christmas break, so I would have about a month to take my time and do it right. They would be paying me a certain agreed upon amount, no matter how long it took me, which is why I am wanting to know how long I should expect it to take once I have gotten good at full re-stringings.
The one thing that is really out of my comfort zone is re-surfacing the bridge. What does that really mean? How can I learn to do it without waiting for a convention?
Thanks for all your help! I look forward from learning a lot from you guys and contributing as week.
David Pritchard
434-841-7735
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David Pritchard
Forest VA
308-635-0500
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