Most likely, you will have to remove the drain flange from the drain. It will have cross hairs, where you can unscrew it using a tool called a spud wrench. If you do not have this tool you could try using the handles of a channel locks. If you remove the drain flange, remove the old systems putty then continue to remove the clog. When you are ready

A blocked tear duct  can cause - 1. Excessive tearing 2. Redness of the white part of the eye 3. Recurrent eye infection or inflammation or pink eye 4. Painful swelling near the inside corner of the eye 5. Crusting of the eyelids.

When the nasolacrimal duct, the tube which drains tears into the nose, is blocked a procedure is usually required. During this procedure, called a DCR (Dacryocystorhinostomy), a hole is created between the tear sac and the inside of the nose.