Originally Posted by Prism99

Does your sewing machine have a top-loading bobbin? Or a front-loading bobbin? I think that is what makes the difference.

If you have a top-loader, it's enough to cut the hole to fit the machine.

If you have a front-loading bobbin as I do, typically you make the hole larger than the machine and create a plexiglass insert to fill the gap between the hole and your machine. I believe hardwares stores will cut plexiglass for you to a paper pattern; you would add legs to the plexiglass to keep it at the correct height.

Edit: Here's a tutorial for the top-loading bobbin:
http://frommartawithlove.com/diy-ike...able-tutorial/