Can't setup my website without WWW

My website is currently up and running with this default address and SSL: www.thepentool.co

Problem I’m having is this:

I cannot set up “thepentool.co” to be the default address, SSL doesn’t work for some reason with this address while with “www.thepentool.co” being the default one everything works just fine but obviously those redirects don’t serve good for page load times. I’m trying to cut them at the moment

My goal is to set “thepentool.co” to be the default address and make SSL work with it.
My records look like this at the moment: