As recommended by various do-it-yourself web sites to use the following method, I chose not to use a small screwdriver to remove the end cap by prying at the edges of the distributor housing. I didn't want to mark/gouge the distributor housing.
Instead, the original end cap was removed by drilling a small hole through it and then using a hooked pick to then pry it out. The metal of the original end cap is quite soft and thin.
As a replacement for the original end cap, a 1 1/4" frost plug was used. One with a 1/4" wall height fit perfectly. Not bad for under $2.
The inside edges of the distributor body where the stake marks are located were filed down smooth using a small jeweler's file. This made tapping in of the frost plug possible.
Also, so that the edge of the frost plug does not scrape the distributor body thereby possibly introducing aluminum shavings in the bearing area, the edge was filed at a shallow angle with a fine flat file.