I would say cancel your operation. I have passed about 7-10 stones that were 1/2 inch in diameter. And I have passed over 1200 stones that were smaller than that. Read more on this website and you'll find many success stories of people passing stones much bigger than .6 cm. Your bile ducts open plenty big when you are doing the flushes, thanks to the epsoms salts! I would encourage you to try flushing them out yourself... we will be here to guide you through the process! Good luck!