Searching for 28 4 K0 caldwell balance

Thank you for reaching out to us. I am sure we can replace this balance. Before we proceed, we need to see better photos of the nylon fittings on both ends of the balance. It seems in your first photo, the top nylon fitting seems to be missing. Those nylon fittings play an important role in recommending the correct balance. Once we have those new photos, we will start our search and get back to you with our suggestions. Thank you. 

Thank you for the photos. Have a look at our S380-24 channel balance. This comes with the 19-005 balance top and 15-005 bottom balance shoe. Compare your nylon fittings with ours to confirm this is the right balance for you. If so, then you can go with the 2840 option that holds a sash weight of 23-28 pounds.