The plastic casing of the coil balance broke and the coil unraveled and is on bottom of window see 20201201-142912 the place where it was supposed to be is viewed on 20201201-143018 the other side has the correct coil balance in place see 20201201-143041 the window sash weighs 16.6 lbs
what parts do I need? and how should I install them? do I need to remove the old coil balance?
Thanks
Richard