I was using the lids but in that video I was trying out using tape for alignment...that method wasn't a hit, and just happened to be picked up in that video. I found the best way to keep the sticks aligned with those molds was to use binder clips - photo here

There are norpro/progressive molds that now have a ridge to help alignment - https://www.amazon.com/dp/B0002IBJOG/ - I haven't tried them, but perhaps your alignment worries are moot with these?