Building a gearbox / Attaching a motor?

[Alex.q]

Don't worry about asking "embarrassing" questions. Even if you think something should be obvious, many people don't know it. It is also important to ask and find out the correct way of doing things to prevent destroying components. Nobody expects you to know everything about how to put together a robot if you have never done so before. (Also, for a rookie team, it isn't that late in the season. Some teams come to regionals without a working robot.)

Also, I knew about press-fitting, but I didn't know how to do it, so thank you to the poster and those who answered. I wish I had asked last year when we were trying to make a minibot.