Sorry I don't know what he's talking about. Maybe some pictures may be helpful. All I picture is a drum spring on an old drum brake. Tey had a special tool for installing those. May be the case here too.
When you're dead you don't know you're dead. It's the same way when you're stupid.
Balance - 31.0 cm, Weight - 358 g, SW - 346 Kgcm^2