My wife wanted some goblets laser engraved as last-minute Christmas gifts. Usually, laser engraving round glass objects is a piece of cake...but goblets tend to have small mouths, wider bottoms of the drink-holding section, and short stems. The short stem and tiny mouth conspire against the height adjuster on the rotary attachment.
This short Instructable will show how I solved that problem using a simple, low-tech (and very low-cost) trick. I made her gifts at TechShop: http://www.techshop.ws
(I neglected to get photos while engraving the gift goblets, so I tracked down another goblet and repeated the process. The clear goblets were the last-minute gifts. The blue goblet was originally engraved to get photos for this Instructable but later became a gift as well.)