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Siegenia (SI AUBI) Worm Housing Screw Spare Part Screwable for Window Gears and Balcony Door Gear Lock for Favorit Trial Series 3 & 23 with HauSun Upgrade : Amazon.co.uk: DIY & Tools
Si Aubi Siegenia Bi-Fold Door Hinge Kit | eBay
SI Siegenia FS-Portal Bi-Fold Door Hinge (Carton C) - BOTTOM SECTION