4. Contact replacement ............................................................................................................27
4.1 Dismantling the boards .................................................................................................29
4.2 Dismantling the moving main contacts ..........................................................................29
4.3 Dismantling the moving transition contacts ...................................................................31
4.4 Mounting the moving transition contacts .......................................................................32
4.5 Mounting the moving main contacts .............................................................................33
4.6 Replacing the xed main contacts .................................................................................34
4.7 Replacing the xed transition contacts ..........................................................................34
4.8 Mounting the boards with transition resistors and xed contacts ...................................34
5. Specication of materials ......................................................................................................35
5.1 General .........................................................................................................................35
5.2 Diverter switch housing .................................................................................................35
5.3 Diverter switch ..............................................................................................................35
5.4 Tap selectors ................................................................................................................35
5.5 Conductors ...................................................................................................................35
5.6 Gearing mechanism ......................................................................................................35
5.7 Drive shaft systems .......................................................................................................35
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