Gary,
Re: your question about wiper switch. I had to tighten mine so I thought I would take it out to show you the components.
It sounds to me that you are missing the two deep dish washer/spacers. One goes behind the dash and the chrome one in front. I also made a tool out of 15mm copper pipe with two teeth to locate in the nut for tightening. The flaw with this switch is that the thread around the spindle is plastic. Prone to cross threading and striping with over tightening - not great.
FYI I have included a pic of the rear of the switch where a PO inserted a push switch for and electric wash pump instead of a diaphragm, sorry I do not have any info on how it was done.
Stuart