In SX Microcontrollers, SX/B Compiler and SX-Key Tool, George Herzog wrote:

I make two layers on a Inkjet with Eagle.
I just print out positives and expose the first one.

Then I drill two of the required holes that are diagonally opposite and farthest apart.
[I use a tiny bit and drill by hand with a Pin Vise -- lots of control for accuracy.]

These two holes are used to line up the second side for exposure.

Bingda... bingda ... Boom!  
Tight registration as everything between will have less error than those two holes.

After that is it pretty straight forward.

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