Got a long necked vase? Need to trim the bottom? Check out a simple hack for trimming those giraffe necked bottles. I use a Giffin Grip, a bucket or cup that is deeper than the neck and some clay around the rim. This keeps the bottle up right, centered and supported on its shoulders. No more worry about distorting the neck. This trick also works on asymmetrical pots that need a trimming.
Try it out and let me know how it works for you.