This video illustrates the importance of squishing the center prong of the cap flat enough so that it doesn't get in the way when you are trying to close you
Knitting Help - Adding Plastic Snaps to Your Knitting
CGOLDENWALL Electric Rotary Fabric Cutter, Multi-layer Electric Fabric Scissors with 1Cutting Thickness, for Cloth Fabric Leather and Carpet, Comes with Replacement Blades, Sharpening Stones 110V : Arts, Crafts & Sewing
Snaps are Falling Off My Fabric - Tips to Fix
Snaps are Falling Off My Fabric - Tips to Fix
Snaps Not Closing - Tips to Fix, video recording