^^^Correct. You need to drill the 2nd hole. It's fairly quick - take a small bit to start a hole. Then use a 1/2" bit. Repeat again with the back side of the frame. My 1/2" drill bit was just long enough but I had to use an extension for the pilot hole.
Use some cutting oil, lubricant or WD40 at a minimum. With the right drill speed, bit and lubricant it can take surprisingly little time.