grooves

Hello guys, Here´s a new video of me making grooves with a router and a guide. A simple tip for begginers. Fui. https://www.youtube.com/watch?v=34V9j9ENgDM

I'm working on a box that I want to insert a 16th inch glass pane near the front opening of - but I'm not really sure how one goes about making such a small groove (or really any groove) with hand tools. I know that tongue and groove planes exist, but are so expensive and specialized... is...