I have just watched all 8 of scrappydew's videos on vimeo and the first two basic videos of SusanBlueRobot's on PCS. I am not understanding the snapping at different sizes when anchoring letters. In the videos in a couple of places when letters were being anchored, snapping was set at 1/8" before the anchoring was begun. In the scrappydew video, he said he choosing 1/128" would not be good, but he did not say why and he did not say why 1/8" was chosen. What is the purpose of this snapping and what does the different sizes do? I am very much a beginner. Thanks.