Abstract: An apparatus for modifying window blind assemblies. The apparatus may have a base plate and a wall, the base plate and wall supporting the blind assembly. The apparatus may have a horizontal clamp assembly attached to the base plate that may secure a side of the blind assembly. The wall may support a slide clamp assembly. The slide clamp assembly may be slidably connected along the wall and pivotally adjusted to secure an adjacent side of the blind assembly. A cutting assembly may be attached to the base plate. The cutting assembly may have a saw guide for securing a saw that may be positioned to modify the blind assembly along a plane. The apparatus provides measuring and cutting the adjacently bundled blinds together along a plane, until the bundled blind assembly is again secured within the apparatus for modifying another end of the bundled blinds, for symmetry purposes.