Why is my Wii disk drive rejecting disks?

When I put the disk in my Wii, it rejects it once, tries again, and rejects it again. I've included a link to a YouTube video showing the problem and the exact mechanism in question. https://youtu.be/dtUDQYSwb0c

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 0
crwdns2934285:0crwdne2934285:0