Channel Balance Shoe 15-004 or 15-005

Question

On the !5-004 and 15-005 is the measurement from the inside of the wing or outside?

User submitted a photo of a window balance.

Tom · Accepted Answer

The depth measurement for both shoes are from the outside. Consider it the entirety of the depth. I suspect you have a 15-004 that has just worn down a little with age.