I'd advise against using pastry cutter. We tried that and had terrible issues with the spacing between the blades. There is too much play in the accordion mechanism, and the wheels are wobbly. If you do use one, the best thing I've seen is to screw the spacing to a piece of hardwood. This will eliminate most of the play in the accordion, but won't do much for the sloppy wheels.
- If you would like to buy my pastry cutter, I'll sell it for $10.
We ended up building a roller cutter similar to what Jon posted above. (The part numbers are FABULOUS!) Thank you Jon.
I tried using all-thread with various spacers, but found the pizza blades would get stuck in a thread and get cock-eyed (non-parallel). So, we went witha length of bar then used cap nuts to hold it all together.
I imagine we could get our bar threaded and thus be able to have nice handles. That will be a great step up.