Search:

Misterdavid,
If the hone isn't completely flat, it will need to be lapped. I suspect if it's old and used for years, it will need lapped. You can post a picture if you aren't sure and someone will...

+1 on what mparker762 said. Here is a link to a good tutorial on lapping.

Hone Lapping 101 - Straight Razor Place Wiki

I'm not familiar with your particular barber hone but most are very hard....