Vertical Hitch Pins, was [CAUT] duplex position

[David Love]

One thing you can do if you are concerned about the potential hazards of
vertical hitches but want to increase the backscale length and don't
subscribe to the tuned duplex theory is replace the aliquots with strips of
small diameter brass half rounds.  You can snug them up against the hitches
and get a bit extra backscale length that way.  

 

David Love
davidlovepianos at comcast.net
www.davidlovepianos.com 

-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Erwinspiano at aol.com
Sent: Saturday, January 05, 2008 9:02 AM
To: pianotech at ptg.org
Subject: Re: Vertical Hitch Pins, was [CAUT] duplex position

 

  Hi Frank

  Good to hear your perspective. In the case of standard hitch pins &
duplexes the down side is often too short of rear string lengths tying down
the back scale,.  Obviously this is  news but when the standard hitch
array/duplex  is retained using an adjustable plate elevation system
addresses most of the issue regarding future adjustability of down bearing.
& of course the nose bolts on Steinways & other pianos with less rigid
plates than M& H can be adjusted slightly up or down  with a positive change
in bearing pressure. 

  SO your warnings are good food for thought.  I can imagine myself
installing new vertical hitch pins in a clients Priceless Steinway & having
the plate crack.( & the ensuing debacle) Although it's probably highly
unlikely still gives me little comfort.

  To each there own

  Dale

Since setting bearing was deferred until after the string is drawn to full
tension, there is a wide margin of error.  I remember pianos soundboards
failing with a loud bang, the soundboard pulling up, and breaking free from
the belly rail in the high treble.  This would never have happened with
traditional hitch pins.

Finally, vertical hitch pins open the piano to devastating results from
unknowledgeable techs making misguided changes in down bearing.  I hate to
say this on a piano tech list, but I have seen the results of such misguided
movement of the strings on vertical hitch pins.   I would prefer to
permanently set the bearing in the manufacturing process, in a way that
cannot be compromised by well-meaning, but misguided techs.

Frank Emerson

 

 

Dale Erwin--Piano Restorations
4721 Parker rd
Modesto, Ca. 95357
Shop 209-577-8397
Web site http://www.Erwinspiano.com <http://www.erwinspiano.com/>  
Restoration & Sales of
Steinway & Sons & other fine pianos.
" Soundboards by Design"





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