Windshield Wipers

I lost one today....it just stopped working. The driver's side is fine, thank goodness.

Thought the wiper nut was loose (happened on my MG) but it tightly connected and when I move it, I can sear a scraping noise from within.

I think that I may have lost a nut/bolt ?

Cannot seem to find anything in my service manual... from what I remember from under the dash, will I be able to get to the wiper arm and re install a bolt without having hands the size of a leprechaun ?

Thanks