Thanks Toxo,
That may be enough for me. I plan to add a 120ED Skywatcher or Astro Tech 106 APO on it for CCD image. I think that is around 15lbs.

May I ask one more question? Where I can find the method to make the well balance? I know how to do the german mount, but I don't know how to do the fork mount. Thanks guy.

Cheer,
Joseph