A sliding clutch for torsion-limiting force transmission between a reel and a rotating part includes two bearing members disposed concentrically within one another. When tampering is detected the encrypted binding is terminated thereby preventing the door from being opened. Results are presented showing enhanced performance resulting from use of the inventive catalyst. The etching solution is agitated with oxygen or a gas containing oxygen blown thereinto during the immersion of the alloy into the etching solution. The gate has an intermediate portion over the active region and two end portions connected to the intermediate portion.