The present invention provides a methodology for truncating a logical structure having data matching a predefined pattern. In principle, such collectors and collector arrangements are know in prior art. The serial numbers can be captured from stationary currency prior to entering the counting machine, and the serial numbers may be authenticated by comparing the number against various databases. The carriage member threadedly engages the threaded drum portion, and is movable along the threaded drum portion when the winding drum is rotated so as to wind the pull cord on the smooth drum portion.