I stipulation to drill straight holes within a piece of plastic using a drill press. I hold to slide the plastic out respectively time. What can i use to get the holes adjectives straight down...

time. What can i use to get the holes adjectives straight down a line. Chalk?
Ladybugs on the 22nd floor?
Answers:    Either snap a chalk queue, or use a straight edge and draw the file, you may even choose to go as far as using a center punch to start surrounded by the right spot when drilling, even though plastic is soft, the puch will keep the bit from walking
Help, obligation pest repellent?
Find the center of the plastic and use a sharpie to draw the procession.