When there isn't space for a powered device a manual tool like this is might be the only choice.

Draper Redline Junior Hacksaw | Soft Grip | Cutting DIY Tool | Blade Tensioner | 68819
4.0

JDBrands Junior Hack Saw - 150mm/6 - Cutting DIY or Profesional Tool - Finger Guard - Red Powder Coated - 32tpi Blade Included (Hacksaw w/additonal 10 Blades)
4.0