MB3 122b: Extending a Baby Stroller Hood on Shabbos (315:2-3)

Spreading a cover over a pergola on Shabbos and adding onto an אוהל עראי on Shabbos. Spreading a sheet over a wagon/carriage constitutes making an ohel unless it's already spread out 1 tefach or more. The rolled-up section doesn't count towards a tefach. Extending a retractable stroller hood on Shabbos is permissible even if it wasn't extended a tefach.