Pivot for Larmco Windows

Our medal slots that screw to the window itself broke off and the window just falls down, We put a tile in to hold the window open. The spring that is on the frame appears ok but we cannot find the right size medal pivot that screws to the window that goes into the slot of the spring pivot. These windows are only 5 years old and now because of Larmco going out of business we do not know where to go.