Changing a Bobbin Winder Spindle Gasket?

How do I change the winder gasket? I got my sewing machine apart and need to change the gasket that is on the post of the bobbin holder (winder).

When you put the spool on the post and push it over to the right so the machine will wind the bobbin it won't turn without that gasket or ring that is on that post down inside the machine. You can't see it from the outside, you have to look down inside with a flashlight. I just have to get the gasket probably from Brother for the CS-8150.

By Karen Wilson