Just an FYI.
I finally got both of my bikes adjusted the way I want them (saddle height, stem adjustment, etc...), so I filled in the allen heads with solder. I let the solder set for about an hour and tried to pry it out with a screwdriver. No go. It seems to be a good solution for securing ones saddle, stem, etc.....
I used the solder gun and some spare wire to wick up the solder for a removal test and it works well if I ever need to swap parts or adjust anything.