I know this isn't a direct response to your question but, it may be helpful ...

I used HC-110 for years almost exclusively. Then I "discovered" Pyrocat-HD and D-23 and never looked back. I have some HC-110 squirreled away in brown glass bottles, but I am unwilling to bet my photographic future on Kodak keeping it together (I never thought I would say those words after 50 years of being a happy Kodak customer).

You will love Pyrocat. It has less visible grain the HC-110 and is a super flexible with dilutions and developing schemes.