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  Richard is correct about Scotch/3M auto-threading reels. They were and are 
a menace. Another bad, apparently untested idea passed off as progress. I used 
a few when they were introduced during the 1960s. Some years later I noticed 
just what Richard mentioned: the tape on the inside of the spools was sticky 
and irremediably damaged. The leaking adhesive had made the coating containing 
the sound glue to the top of the layer wound below. My tapes were Mylar, not 
acetate, but it didn't matter.

  Don Tait