Collet chuck is stuck quite hard. Are there any little tricks to loosen it?

Q　Collet chuck is stuck quite hard. Are there any little tricks to loosen it?

A　Please refer to the following procedures;

Please turn the set ring hard to R- direction(be able to release the tool).
Place the chuck wrench as shown.
Loosen and remove the collet chuck by turning the chuck wrench.
*if you can not loosen the collet chuck, tap lightly the chuck wrench with a small hammer as shown.
Set a new collet chuck.
Tighten the collet chuck with chuck wrench.【Warnings】
(1)Be sure to insert a blank bur into the collet chuck before changing.
(2)Do not change the collet chuck if the set ring is set on S-direction.(collet chuck is tightly closed)
(3)Do not turn the set ring from R-direction to S-direction while changing.