The sash balances hold the weight of the window pane, over time, the springs can wear out or fail. Window Block and Tackle Sash Balance If your windows (sashes), are having problems staying up when opened, it may be that your sash balances or hardware needs to be replaced..
See Sentry Supply 650-7901 for screw sizes 6-8, Sentry Supply part 650-7902 for sizes 8-10, and Sentry Supply part 650-7903 for sizes 12-14, or Sentry Supply part 650-7904, which includes one of each one-way screw remover hand tools. The security drive heads of these fasteners allow for easy installation with a flat screwdriver, but require the use of a one-way screw remover tool. one-way pan head sheet metal screws contain a total of 100 fasteners per pack.