HI! Thank you so much! I use cylinder type molds like pringles cans, or any plastic cylinder-type containers that I can tear or cut away after the cement has hardened. (I will be purchasing silicone and plastic column molds because I am getting a few orders for them that I need to keep up with). Right after the pour, I place another circular mold in the center while the cement cures. No boring out. I sand down any rough edges.