I use lots of tapered wood plugs in my projects that I make with plug cutters on the drill press. Brushing or squeezing glue onto the plugs has always been a messy, time-consuming affair. Once, while I was breaking new plugs free from their board, I realized the tapered holes they leave behind would make a perfect reservoir for glue.
Now, I just fill one of the holes with glue and dip my plugs into it to prepare them for installation. No more squeezing, brushing or mess.
– Alexander Cantacuzene