Here's a close-up of the worn eccentric that I found in one of my engines.

Here's the crank snout with the above pieces removed

Here's the completed aluminum spacer in place.  

I would like to note that what's not shown is a steel spacer which spaces the eccentric away from the distributor gear. 

My spacer looks very similar to the steel spacer,  and if one were to purchase another stock steel spacer,  perhaps it could be used rather than making one from scratch.

The stock steel spacer is however a bit thicker than the spacer I made,  and I don't know how this would effect the alignment of the distributor gears to one another.  I may make another aluminum spacer,  which is the thickness of the eccentric plus the stock steel spacer.  This way I may save another 2g.

The finished product.