Spiral balance pivot bar
A home owner from Burlington, ct says:
October 4, 2016
Windows were purchased from Stevenson millworker in Ct. They are no longer in business. Part is 2-1/2 inch long 5/16 wide with hole 1" from the end . The broken cast piece goes in the top window and the other bar goes in the bottom window.
Paul from SWISCO responded:
October 6, 2016