SW/parts question

[Mark Davidson]

My current project (Miller baby grand) has three different types of shanks.
Is that common/usual?  The transition from square to cylindrical occurs at
different places - longer square sections in the bass, shorter in the 
treble.
Are such parts available?  Atached shank photo.

Is there some approximate guide for mapping hammer set weights (e.g. 14 lb)
onto SWs?  This piano is approximately zone 4 (1/2 low).

-Mark