Yes, this was tried using a device that was called the "Zapper". It consisted of a tweezer that was energized by a doorbell transformer, and it would send current through the center pin. This would produce a lot of heat and free up the flange. Too much heat, and you'd smoke it. I once did an experiment on some very sluggish hammer flanges. I tried heating with a heat gun, I used my Zapper, I tried alcohol/water, and finally repinning. I kept the action in my shop for about a week, and here's what I found. Except for repinning, everything eventually became sluggish again. My speculation is that the felt was shrunk to allow the pin to pass the friction test, but if there was any humidity introduced the felt would swell again. Where there is a lot of moisture in the air, eventually these flanges will get sluggish. Even if you put them in a hot-box (which I also use), excessive moisture will get in there again, unless you install a damppchaser to prevent it from sucking up moisture again.
Wurlitzer used to use a mix of silicone oil and naptha to lubricate their flanges. Before Protek, that was a solution that some techs used to use, and Wurlitzer and I think some other manufacturers also. I have had good luck on Wurlitzers using Protek, but that was not in a very humid situation here in San Diego. If you wanted to experiment, both silicone oil and naptha are still available as far as I know.
In my experiments, I used various strengths of alcohol/water, and repeated dousing of flanges had mixed results. If I got too aggressive, I could get them free, but the hammers would become wobbly. Especially if I used Protek afterwards, they were way too free with unlimited swings. On a spinet or cheap piano, I wouldn't worry too much, but on a decent piano, alcohol/water is not predictable enough to get consistent results. If you do use it, let it dry over time, not using a heat gun. Then follow with Protek. You might be surprised how much the Protek works after the alcohol/water treatment.
------------------------------
Paul McCloud, RPT
Accutone Piano Service
www.AccutonePianoService.compavadasa@gmail.com------------------------------
Original Message:
Sent: 04-20-2025 13:20
From: Anthony Willey
Subject: Methanol
Did you mean to say Ethanol instead of Methanol? Ethanol is the alcohol that people drink. The stuff in Everclear and all the other drinkable alcohols. Methanol is a toxic alcohol that will make you go blind if you drink it. You can buy it in fuel additives like Heet. In addition to burning cleanly and pulling water out of fuel lines, I'm sure it also does interesting things to felt. But I don't think it would be widely used because of the toxicity issue.
I've had some luck with a liquid solution that Schaff used to sell but that I can't find anymore. It had a really strong smell. I can't remember the name of it. (Garfield?) I'd take the action outside, run a big bead of solution down the flange pins, wait 10 minutes for the smell to dissipate, then bring it back in, and all but the toughest flanges would work again. It was, in my mind, the intermediate step between CLP+friction and Repinning.
Out of curiosity, has anyone ever tried "ironing" the felt by heating the center pin without taking it out? I'm imagining a soldering iron with a pointy tip touching only the end of each pin for a short time.
------------------------------
Anthony Willey, RPT
http://willeypianotuning.com
http://pianometer.com
Original Message:
Sent: 04-19-2025 18:21
From: Steven Rosenthal
Subject: Methanol
I'm trying to get an otherwise nice 50 year old Wurlitzer studio upright action going. The hammer flanges are chronically tight and lubrication has proven to be only a temporary fix.
It's been a long time since I've tried "watering" the action, I know methanol is the preferred alcohol but I'm having trouble sourcing it. Is there an alternative? Should I try straight water first? I'm trying to find an alternative to repining the whole action.
Thanks in advance.
------------------------------
Steven Rosenthal RPT
Honolulu HI
(808) 521-7129
------------------------------