I have an early 80's schwinn World Sport (83 I think) with Shimano Tourney rear derailleur. I'm just trying to put the derailleur back on the bike and don't remember how it looked before I took it off.

If you have a similar style of derailleur/bike, any pics would help a lot.

I'll try to explain what I have going on even though a pic is really needed. The DR has a part that looks like it would be tightened onto the dropout via the normal axle nut. But it also has a little hole that could possibly line up with a hole on the rear dropout. The opposite side of the bike has the same hole on the dropout. I'm confused as to where the hole in the RD (and the associated bolt & nut) should be located.
If that makes sense to you, and you can answer, well that's awesome!

Thanks for any help. Sorry no pics