A spline installation device for use with a spline/rail type frame to assemble the splines to the rails. The device including a base that defines a platform for receiving a frame subassembly; and a plurality of linkages that are disposed about the platform and coupled to the base. Each linkage is configured to move between a first position in which a fence bearing surface thereof is at an angle other than 90 degrees relative to the platform and a second position in which the fence bearing surface is set at an at least substantially 90 degree angle relative to the platform for locking and holding the frame subassembly in place. The linkages further being configured to receive a spline instillation tool for locking the splines in place relative to the rails.