Is the '47 assembly any different than a '50? Are you assembling this with the battery connected? If so, I would disconnect the battery to make it easier. Also if similar to a '50 what I see above missing is the contact pin. Thus:
Spring
wheel
contact pin
plate
nut
horn button


Craig

My '50 Chevy 3100 5 window, '62-235cu, 3:55 rear
My truck ....... Respect The Rust
If I'm not working on my truck, '65 m00stang or VW camper, I'm fishing with the wife or smoking Salmon.