Coil Spring Balance Replacement

Thanks for posting. This looks like the 15-177 Pivot Shoe, which works with Series 152 Coil Balance springs sold separately. The stamps on the springs are the most reliable to go off of for the spring weight. I am afraid we don't carry a 10 pound coil spring for this Series; however you could use a pair of the S152-5 5 pound springs on each side of the window sash instead. This would equal the same amount of support. If your old coil housing is undamaged you can reuse it--otherwise see the 15-143, 15-144 and 15-145. These pieces 'sandwich' around each individual coil. Let me know if you have further questions.