repair will probably cost more than a new one. This wheel can you see the direction it needs to go in to miss the paper? If so get a thin piece of wood and carefully press the wheel in that direction. A gentle tap may reseat it.
Huawei P10 review
1995-2015: How technology has changed the world in 20 years
An overview: What leading creative agencies are doing to improve diversity
New iPad, iPhone SE & Red iPhone 7 on sale now
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.