Found a couple neat spacers for fibre cement, that eliminates snapping lines. I have another set of guages by Malco that we are using for most, but these knock off spacers, work really good for small pieces, where the malco guage was not that great.
Canon EOS Digital Rebel Full EXIF / IPTC
Photo 155 of 224, IMG_5818.JPG, 35KB, 640x427, 598 Hits
Other Sizes: Medium Original