I don't think you can put that variable in the JOIN clause. Try this:
sSQL= _
"SELECT AWI.exact_date, " & _
" AWI.job_number, " & _
" AWI.fitter_name, " & _
" AWI.job_duration, " & _
" fitters.fitter_phone " & _
"FROM AWI " & _
" INNER JOIN fitters " & _
" ON AWI.fitter_id...