Anderson Sash Balance
A quick learner from New York says:
April 3, 2015
I learned a lot from previous customer Q&A postings, so this is a great help to your consumers. I believe this is my best image out of 6, with different lighting and angles, which implies I need part 24-431 to replace my Andersen 4#19.
Tom from SWISCO responded:
April 6, 2015
Hello again! You are correct once more. With a stamp of 4#19, I recommend our 24-431.