Thanks Dave D, John, Rob Dave H, Thank you all…
It pays to double measuring and measuring once more.. I had ordered another Collet chuck, for I was almost sure that, this chuck would be damaged beyond use. What do you know, the new chuck arrived wouldn’t accept my collets they were too tall for it.
Aren’t these stuff supposedly standard? I have 1-16 spring type collets set, only one of them (8.5-9 was a short one) amongst, fits in this new chuck.
Now after removed chuck, I looked through the spindle quill and haven’t seen any particles or sign of rust, sprayed with diesel fuel and brushed by gun barrel brush. But is there anything else I should be doing to preventing happening again.