The S4/5 starter cord is turned 90 degrees by a pulley pop rivetted into the firewall. Starting loads thus generate a 45 deg. inwards to the pilot & upwards pulling hard against the firewall steel sheet.
After long use the rivets can get loose & should be replaced before the pulley block breaks out. Firewall fatigue & cracks can also occur here around the pulley's cut out.
Have close look at least every Annual inspection & deal with any latent problem before it lets you down.
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