Thank you first to Ms. Photo_Bug for the assist. She verified it worked.
If your vtkd is having a sticky switch, here's what you need to do-
You'll need a safety pin or sewing needle. Use the air intake holes on the threading to get the needle/pin under the post, pry it up some. Now if you can see the air holes in the post, you need to gently (key word gently) get one of these moved closer to the air intake hole on the thread by using the needle/pin to twist the post slightly. Key thing is to be very gentle, too much force and you'll break the post off. Hope this helps.