Donna from SWISCO.com responded:
date: 04-01-09
To remove/replace coil balance pivot shoes
For lower/inner sash there should be a cut out at the top of master-frame,
it may be behind the sash stop, if not cut to slide the pivot shoe out/in.
For upper/exterior sash there should be a cut out at bottom of master frame,
it may be behind the sash stop, if not cut to slide the pivot lock shoe out/in.