This is a simple hack, using a chopping board. But young Charlie likes to call it "An initial toast machine", because we used to make toast with our initials on.
Machine Making
Using two chopping boards, some bolts and some nuts. I marked out a 10x10cm grid and drilled holes 4mm diameter. I wanted to use the plunger on a syringe but the diameter was 10mm. So for the plunger I using a bolt. Any way picture is worth a thousand words.
Trial
After poking out a pattern with the plunger. I got the following. (Shown with a mirror image and some markings to give a clue.)
Which had one further test still to pass;
More Toast
Charlie then insisted that everyone has toast, more tests:-
