An affinity generation system according to the present invention analyzes a profiled user’s authorship and document usage within an \u2018intranet\u2019 to create a set of affinities between documents and topical classifications used in a hierarchical content catalog. An offset angle of a first twisting roller can be adjusted by only rotating a first shaft roller support member in the roller offset angle adjusting device of the manufacturing apparatus of a fiber-reinforced resin strand around the axis of a first driving shaft which is orthogonal to a first roller support shaft of the first twisting roller. The lift mechanism and tilt mechanism are each self-contained modules that can be optionally installed into the power wheelchair. A bi-directional communication link extends between the remote computer and the well tree processor.