double-wound strings

[Ron Nossaman]

>Friends,
>
>I posted this question a couple days ago and got no helpful answers. 
>While tuning a 1956 Baldwin F grand piano I noticed it had no
>double-wound strings.  Single-wound strings the whole way to the
>bottom.  How common is this?  I haven't noticed it before.
>
>Regards,
>Clyde

Doesn't the S&S M have all single wound strings? I spec double wound on all
monochords with rescaling. I like them to be able to flex.

Ron N