If you want to make an array with out using an expensive arrayer try to get a disposable Derma needle, 2mm. Dermatologist use them and they are cheap. That is what I use often when I need to punch something with just a few cores. I did a workshop at the NSH on tissue arrayer construction a Histologist by the name of Bill Hiller showed me a way to create a stylet out of a metal rod. I believe he learned it from another Histologist.
Here's his email if you are interested. Its a cheap way to go and it works wonderfully. This is what I am using to experiment with this manual method we discussed.