A method for manufacturing a tape drive member is provided which comprises forming a shaft from an alloy of a soft metal material and a hard metal material, subjecting part of the shaft to sand blasting for roughening, and chemically treating the roughened surface in a solution which is capable of dissolving...http://www.google.de/patents/US4553186?utm_source=gb-gplus-sharePatent US4553186 - Tape drive member and manufacturing method for the same
