Does the controller just turn or does it pull out? I't think it was held in a hole by a nut on a threaded shaft. Maybe the black ring with the 'Fast - Int time - Slow' will turn counter clockwise and loosen the switch. Or if the knob pulls out look under it for a nut.
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Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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