deskthority

Is this IT ?

http://image.pcwaishe.cn/data/attachment/forum/201508/17/210047phnhhgkyon5ugyy1.jpg
http://image.pcwaishe.cn/data/attachment/forum/201508/17/204716di8ibiuzmu3ttyk7.jpg
http://image.pcwaishe.cn/data/attachment/forum/201508/17/204707q03g2n2m8f2xrxnf.jpg
http://image.pcwaishe.cn ...

Upgrade the sensor,
Maybe center its location, or move it forward a bit,
Make the scroll wheel more durable, also seal better that area if possible, to prevent lint, dust and the like to enter so easily.
Do something about the rattling DPI buttons.
Thinner and more flexible cable
Take the screws ...