Need new unit , spring broke

Thanks for posting. It appears you need an S795-27 with a 15-195B T-Lock Shoe, sold separately. It is easy to swap out this shoe with the one that comes by default with this balance (the 15-195). The video below shows how to do this. Lastly, you'll need to select a stamp option, which designates the strength of the balance. Your stamp of 26-7 is from a rating system we do not use; to know what stamp option to select, we advise you weigh the window sash. You can then match that exact weight with one of the weight ranges listed alongside each stamp option under the product description on the S795-27 shop page.