How to ALLOW Duplicate comments

I’m trying to remove the comment box and allow people to post just their Name and a Link – I’m so close!
I’ve edited the code so it will post without a comment entered, but if click submit a second time I get “Duplicate comment detected; it looks as though you’ve already said that!” How do I turn that OFF?
I know it has to be somewhere in wp-comments-post.php, but I’m not sure what to change or comment out.

The second time you click submit the comment box is as empty as it is the first time, which is the point, but WP is seeing that as Duplicate comment. I need it to be allowed to post.

Hopefully soon I’ll figure out away to remove the comment box all together, but until then how do I get WordPress to post.