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 24-939 to replace my Andersen 9#27.
Tom from SWISCO responded:
April 6, 2015
Good morning! I agree with your assessment. Based on your stamp of 9#27, our 24-939 Andersen sash balance is the best match.