I don't mean to be flippant, but can't you just look at the other assembly and copy that? That's why you only break one assembly down at a time. (right?)

Otherwise, power lines (may be daisy chained) should go to the lug on the banded side of the diode. The spring is just used to assist in the flipper being pulled back down to resting position after it has fired - you should see a couple logical holes to hook that up to. Sorry being so vague but hope it helps some.

The "power" wires are typically of a heavier gauge than the other wire on the coil. Don't know the game, but it is common for the power wires to be daisy chained, which means 2 of them will be twisted together and soldered to a single lug....so maybe that's a clue for you?

If you post the specific game, somebody can just give you the wire code colors I'm sure, if not a picture of their actual assembly.