Piano World Home Page Forums Our Most Popular Forums Piano Tuner-Technicians Forum Squeaks from key centre pin bushings

My upright has developed some squeaky keys, traced to the centre pin bushings. I removed the keys and massaged the centre pin bushings with a small screwdriver to 'rough them up' a little, but the squeaks soon returned.

Are there any better suggestions as to how to resolve this? Should I, for example, use a small needle to puncture the bushings a little to soften them up?

Thanks in advance.

P.

How worn do the bushings look? Some like to use a tiny amount of Protek CLP on key pins, and some prefer Teflon powder.

They are brand new (= 5 months in my possession and around another 12 on the shop floor). My suspicion is that they have hardened and compressed slightly with the reduction in humidity and was wondering if there was a way for 'fluffing them up' again that would last more than a coupe of weeks. I don't want to touch the key pins unless absolutely necessary, so am looking for the most effective, yet minimal, intervention.

Well I don't think a light dusting of Teflon powder applied to the pins with a small flat artists brush or similar, would do any harm.

A drop of Protek CLP or Prolube is what I use. It is not unusual to find excessive key friction in pianos. I often brush a little Prolube on the front pins with an artists brush and put a couple of drops on the balance rail pins with a hypo oiler.

+1 to rysowers post. In regular playing, the key pin usually burnishes the bushings. I have had good results from Protek's CLP and ProLube.

You don't want to "rough them up" as that will probably cause the friction to increase. If the bushings are too tight, size them with heated brass broaches from Pianotek. Polish the key pins with Flitz metal polish, and then lubricate the key pins with McLube 444.

It is sad to hear that your recently purchased, rebuilt Blüthner seems to have developed more and new problems, after all the metallic sounds and zings, tuning instability, creaky dampers, smacking hammers etc.

There are special lubricants, as mentioned, that can help lubricate piano actions and resolve squeaking sounds. However, these are not easily accessible for piano owners, and shouldn't really have to belong in a piano owner's arsenal of tools and supplies to have a satisfying piano playing experience. They are used sparingly and judiciously, by piano technicians, i.e. this is not something that normally the owner of a newly-purchased piano should have to look after.

You have had your Blüthner for only a few months. Normally there is a warranty to cover issues such as the ones your are experiencing on a re-built piano. After all, it has to function and perform as a piano should. That's why you bought it, right?

At this point I think it is really time to haul the rebuilding shop/sales outlet onto the carpet with a concrete list of everything that isn't functioning as it should, and have them go over the instrument thoroughly and address all your concerns. If you only post on the forum asking for solutions to your piano problems, and neglect to make your claims to the rebuilder/seller, your warranty claims become weaker. Forum participants can't fix anything on your piano anyway, someone has to physically come in and do it, and it should be the seller. I would act on it now. Stand up for your rights - you paid a decent price for a rebuilt piano, and they have to make it work.

Actually, the right thing would have been to act on it when the first problems came up.

Never heard a squeak from a mortise, sometime from the balance hole.

The more I read that forum the more Jurgen advices seem to be the most valuable ones!

You are so right Kamin! Jurgen has a lot of piano knowledge. We can all learn something from him from time to time.

Oh puhlease - don't construct a reputation I can never live up to. It may be time for another PW hiatus....

hahahahaha

Max don't use screwdriver now. He use small medical forceps. Device clamped end forceps place the file into the bush, and then rotated it's with a little effort. Thus forming a circle in the felts
http://www.youtube.com/watch?v=r2oWVlbcM70

I know squeaking only from leather bushing, but not with felt bushings.

Gregor, I never met leather bushing. Only felt

PNO40,Sometimes nature has squeak in the oxidation of the pin. Wipe a pin cotton cloth soaked in vodka

Was not the leather treated with some grease of oil before squeaks begin?

I always was told to only use stéatite or talcum on leather bushings (and also to "raise the nap" with a small file if too much impacted.

Prolube spray Maclube (red can) seem to stay for sometime. Protek get gummy soon on metal..

I'm surprised that some have never heard a felt keybushing squeak. It is somewhat rare but does happen occasionally, usually on older pianos, and usually at the balance rail pin.

My 1937 Weissbrod upright has leather key bushings.

Quite right, Ryan. I never gave it much thought but I only experienced balance rail bushing squeaks on American pianos. Same with whistling centres on upright butt flanges. I don't recall dealing with squeaking bushing cloth since I have been back in Europe.

I suspect graphite impregnated cloth. I seem to remember something about that in old advertising literature. As we know, graphite will make the squeak worse, given time and circumstances.