Hi Rachel - yes you can emboss normal brass stencils with your Sidekick - as long as they are narrow enough to go through. You will need to add some shims (I just experimented with pieces of paper/card until I got the right depth of embossing results). I was told to get some Zip'eMAte embossing foam - which I did and it works great! Here are the instructions I was given:
To Emboss
First, cut your sheet of Zip�eMate embossing foam down slightly so that it is narrow enough to fit through the width of the Sidekick.
1. Place one clear cutting mat on a flat surface. Place your handmade paper shim on top of the mat.
2. Put your brass stencil face upwards (if it has an obvious �right� side, if not, it doesn�t matter).
3. Put your paper upside down on top of the brass stencil (you should be looking at the back of the paper).
4. Place the Zip�eMate embossing foam on top of the paper.
5. Put the other clear cutting pad on top of the embossing foam.
6. Run the �sandwich� through the machine forwards, do not take it out and then run it backwards so that you get �two passes�.
When you remove the cutting pads from the machine you should now have a lovely embossed image on your paper.
Have fun!
Ruth