sencore: Tube Checker (Tester); Mighty Mite IV (4

Need the rotary wafer switch S4 (SETUP) for the Sencore Mighty Mite IV.  Finished full restoration and then found the wafer cracked in two.  Bummer! 

ANYONE have a source for this switch? 

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UPDATE.  The Rotary switch was stressed by the high voltage lead which attachead to it and exited next to the swithch.  I found I could push the two sections of the wafer on this rotary switch back together gently while turning the knob so the contacts fell into place.  The switch appeared functional.  I put a wrap of "whipping twine" from the sailboat (small twine which is very flexible used to wrap the ends of lines on the sailboat) around the wafer running it above and below the solder contacts and tying tightly.  Then applied super glue.  Seems quite firm.  Switch works.  Then I disconnected the high voltage lead which had a one inch run to the exit hole and addead 6 inches of flexible lead to take all the strain off the switch.  Think this may be OK.  Would still like to replace it though. 

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