Step 40: But What About With Suction Cups?
After initially finishing this project, I ordered some suction cups for a vacuum pen. Well, they came and they make the pen work even better!
I got these on ebay looking for vacuum pen suction cups. These were just under $4 for 6 of them, and you could pick between the sizes of 10mm, 5mm, and 3mm suction cups. Prices and selection will vary depending where you find them though.