[CAUT] steinway pedal plate screws

[David Ilvedson]

Just a follow up on Steinway pedal plate screw.   the April 2001 Journal has a tip from Tim Dixon...i.e.   tap the pedal with a 1/4" x 20 NC tap.   Drill the plate with a 1/4" drill bit to enlarge.   Us a 1/4" x 20 x 3/4" machine screw.   

David Ilvedson, RPT
Pacifica, CA  94044

----- Original message ----------------------------------------
From: "David Skolnik" <davidskolnik at optonline.net>
To: "College and University Technicians" <caut at ptg.org>
Received: 7/27/2008 6:58:09 AM
Subject: Re: [CAUT] steinway pedal plate screws


>Ken -
>My apologies.  I was picturing a socket head cap screw, an item that, 
>like my digital caliper, I try to find a use for when I can.  Yours 
>would take a standard 7/16th socket, which I already carry.  Given 
>what tends to happen to the slot in those screws over time, the hex 
>is probably a good idea.  Thanks again.

>David Skolnik
>Hastings on Hudson, NY


>At 11:28 AM 7/25/2008, you wrote:
>>Hey, David,
>>
>>I've been gone this week, so I'm just now replying.  I went through 
>>this a while back.  Those are 12x28 machine screws.  I found a 12x28 
>>tap at the hardware store (that's how I confirmed the size), but 
>>nobody makes 12x28 screws any more.  I bought a 1/4x28 tap and a #3 
>>drill and replaced the originals with a hex head cap screw.  Quick 
>>job, works great.
>>
>>Regards,
>>Ken Z.
>>
>>
>>On 7/24/08 2:01 PM, "David Skolnik" <davidskolnik at optonline.net> wrote:
>>
>>Tom & friends,
>>I have devoted an unconscionable number of hours to this pursuit, to 
>>no avail.  The screw dimensions are .2125" (5.4mm)
>>iameter and 28+ tpi.  There must be someone who knows the history of 
>>this screw, why these dimensions were employed and when it might 
>>have changed.  At this point it seems a matter useless curiosity, 
>>nothing more.  Thanks
>>
>>David Skolnik
>>Hastings on Hudson, NY
>>
>>--
>>Ken Zahringer, RPT
>>Piano Technician
>>MU School of Music
>>297 Fine Arts
>>882-1202
>>cell 489-7529
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