spalled action brackets

[Dave Nereson]

Does anyone know what to do with (grand) action brackets that have
"spalled", or cracked, fragmented, alligatored (not sure what word to
use)?  They're in a 1927 Premier 4'8" grand, and look as though they
were made in the early days of cast aluminum (?) or from "pot metal".
The screws into the keyframe can't be tightened or fragments of the
action brackets will just break off.  Elsewhere all over the brackets,
there are little cracks and flakes of metal coming off -- they're
disintegrating.  I think they've also expanded and thrown the action
spread and other relationships out, so that it now is un-regulatable.
The closest match I could find in any catalog were the Jacob Doll type,
so I ordered some and they're close,  but no cigar -- they or the action
rails would have to be re-milled to make everything fit and regulate
properly.  I suppose new wooden or aluminum or Dural ones could be cut
out of 1/2" maple or plate aluminum.    What have other techs done with
these?
dnereson@dim.com