[CAUT] re-core Steinway action rail?

[A440A at aol.com]

Mark writes: 

<< 1.) I noticed at the factory they keep the new cores (maple 

doweling) in a heated cannister, presumeably to shrink the 

diam. for an easier initial fit?<< 

yes


>>(I intend to leave it in an ABS pipe with a 25w 4' Dampp-

Chaser dehumidifer bar overnight)

     I would suggest two 50 watt bars, left in for two days, at least. 


>>2.) I'm guessing the same will need to be done to remove 

the old core? << 

       It wouldn't hurt to warm the old rails up, a lot.  Also, there are 
often small pins driven through the rails.  They are about the size of 
centerpins, so look carefully for them


>>Any other hints for getting the old core out?

      Anchor the stack as close to the end of the rail that you are driving 
out.  It is easy to deform the entire stack by hammering on the end of the rail 
while the stack is anchored by the action feet.  You will also need a smaller 
diameter drift with a very square end to keep from splintering the dowel as 
you drive it.  The drift needs to be at least 2/3 the length of the rail. 


>>3.) I intend to install the new core (maple dowel) with the 

grain at right angles to the screwholes, unless there is 

some unknown reason to do otherwise?<< 

  Steinway has the grain running horizontal, so that the "mackerel" is on the 
sides of the rod.  My logic says that it would hold screws better if it was 
vertical, (greater exposure to the harder, darker grain), as well as less 
expansion/contraction along the length of the threads,  but more accurate drilling 
might a reason for the factory orientation.   
   Have some thick paste wax handy when you begin to hammer the new dowel in. 
Wax the dowel and use a driving cap, (copper plumbing cap should work). Leave 
several inches on either end and cut flush when you are done.   And make sure 
the inside of the rail is not only very clean, but also that you have removed 
all the burrs from the holes on the INSIDE of the tube.  Chamfer the leading 
edge so it won't get hung up on the way.  
     Ask yourself if maybe a new rail would have been easier!  
Good luck. 
Ed Foote RPT 
http://www.uk-piano.org/edfoote/index.html
www.uk-piano.org/edfoote/well_tempered_piano.html