218c New England Clock with full westminister chimes

I am trying to find the right nut to hold the hands to the face. I got it at an auction and I beleive it was sold through a local gift shop in the 70s

It was working well and chimed 1/2 1/2 3/4 and on thehour
THe hours were off so I had to remove the hands to get it set correctly - but I dropped the nut and cannot find it