How to Get a Nice, Round Home-made Corn Tortilla My corn tortillas have been turning out great in taste but the shape is not so good.  I have a press that works OK, but I think it may be part of the problem.  The tortillas always have jagged edges, and are not perfectly round.  And I can't get them them to the size I want at the thickness I want.  

When I try more masa mix, they turn out too thick, and when I use less masa mix, the edges split and they look like stars...

I once saw a gal at a Mexican restaurant making tortillas on a big flat grill.  She got the mix, rolled in her hands, pressed them out and they were perfectly round and very tasty...  I'm not so focused here on the taste because mine taste good, but the shape...

Still new to making tortillas and working with masa so any help would be great!
I roll them into a ball and use a cast iron press, similar to this one:



I think the official name is a "tortilladora". You can find them online or at restaurant/cooking stores for $10 to $20. 

I wouldn't worry too much about getting them perfectly round. Store-bought tortillas are perfectly round because they're made by a big machine. 

If you're still having problems with a press, I would look into a different recipe or maybe use more shortening/lard.