Double Coil Constant Force Balance

Hello there. I believe the pivot shoe is an older version of the 15-177. This works with Series 152 Coil Balance springs. For springs stamped #4, use the S152-4 4 pound spring; for #5, use the S152-5 5 pounder. For new coil housing, see the 15-143, 15-144 and 15-145. These new style parts 'sandwich' around each coil. See what you think.