Again, thanks Ben for your help with the part number. I had sent in a follow up question related to my original e-mail question. There is a wood head jamb attached by screws to the window frame. The empty hole in the photo shows where that screw pass's thru the balancer. Can I drill thru the new balancer to accommodate these screws without damaging the balancers function. Can you help.
Respectfully
David M. Kirbish
Sorry, David. Let me answer you: there are no holes that go through the new Andersen balance boxes, so you will not need them. Certainly don't drill any! Andersen intends for you to use the lip/flange with screwholes for installation.