If the knob will not unscrew, then wrap the rag around the knob and use the pliers to help remove the knob. Use a flathead screwdriver to unscrew the brass insert (post) in the middle of the stopper by turning the post counter-clockwise. The post is threaded into the crossbar of the strainer.
The standard shower drain is held in place with a screw driven through the center into a lower support. Other drain covers connect with no visible screws or .
The first step to repairing or replacing a shower drain is often removing it from the shower.. Three Parts:Lubricating Your Shower DrainUnscrewing and Loosening the DrainLifting the Shower Drain. . Too tightly and you may break the cover.
You want to discover how to remove shower drain cover. This article will show you some tips when removing shower drain cover. It maybe useful for you.