I'm actually having trouble with this very issue. My perf has a white backing so that isn't so much an issue but the holes are throwing the eye off and it's not seeing the registration marks correctly. Sometimes it misses them altogether. Originally, when I last had this issue, my vendor advised to use a "fill" around the registration marks, and that seemed like it was going to work on the first try this time, (last time I just said screw it and trimmed the perf out after putting it on the window. However reading after the 2nd mark when it went to feed the length, the eye stopped as soon as it hit the fill and didn't even make it to the registration mark and then completely missed the 4th mark altogether. Wondering if there is a trick like lower or raise the eye? Using a Mimaki UCJV300-160. I only need to do a somewhat small section as the vehicle decal goes into the window for only a small section, about 8" into the rear side windows on a van.