How do I remove hair clog from THIS old tub drain?
I live in this older house built in 1958 with a old-school porcelain steel bath tub with an old-school drain with a removable rubber plug. I can't run a barb down to the hair clog through the singular small hole inside the drain plug receptacle. Do I have to remove the plug receptacle from the tub to get at the clog? If so, what tool do I need? Thanks in advance.
<https://lh6.googleusercontent.com/-nYeXrXxlgQM/UIC6fVB8t5I/AAAAAAAAAEA/KpUA5ynroeU/s800/DrainIllustration.jpg>