BT-30 chinese spindle unmount

I need to take the drawbar out from the spindle in the pictures. Draw force is 250 lbs and I need to check the springs and maybe try to fix it. Don't know what was the force when new but it was advertised as bit more than 600 lbs ( 280kg). 
Any sugestion how to take it out? cannot find some proper drawings for this kind of spindles.

UPDATE
Nevermind, it was actually quite easy ... just unscrew the part marked in red. The drawbar will go out easily , but the belleville springs will remain in the main shaft ( so take care not to drop them on the floor as I did ...)

我觉得你可以去BiliBili这个网站上看看，有专门讲解这个的