I have a window that has been difficult to open and close. Recently when trying to close the window I heard something pop and some plastic fall. After inspecting and googling a bit I found that I had a broken balance shoe and learned how to remove it. I located this website but I'm not quite sure which one is the closest match to mine. I'm also wondering if I should replace the balance spring at the same time.
The shoe measures 17/32" thick. 15/16" wide. 1 15/16" high. The only writing on it says "PATENT 4610108".
The balance is 9/16" thick. 9/16" wide. 29 1/8" high. The only writing on it says "29B BSI EL"
Thanks for your help!