EFS 17-85mm f4-5.6 IS. Zoom Ring question.

[Mk50]

Hi All,
Advice or suggestions would be greatly appreciated, preferably DIY ones.

I have this kit lens 2 years now and am very happy with the results. Now the zoom ring has become so loose that when the lens is pointed downward, the lens zooms out. I have noticed that I am getting unwanted zoom blur in about 30% of shots that I take with it.

If anyone has any ideas how my tighten this up myself, I would really appreciate it.

Thanks

Michael