In manufacturing the positioning spring by etching, for example, in the embodiment, if the narrowed portions to be filled in the U shaped grooves of the slider are transferred on {TAIL ~ the film} used in the etching with {HEAD ~ the necessary accuracy}, the positioning spring finished up has the narrowed portions with the precision 
In manufacturing the positioning spring by etching , for example , in the embodiment , if the narrowed portions to be filled in the U shaped grooves of the slider are transferred on { TAIL ~ the film } used in the etching with { HEAD ~ the necessary accuracy } , the positioning spring finished up has the narrowed portions with the precision
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