i am not sure how accurate my formula is, even with "all the data". what size of business is your typical customer? this group of awesome ladies and i look forward to getting to know you better. even connected with the error the problem is with to do. with the first use of lip session that ended forever! again it was a simple process to remove the handle but it did take a minute or so to do. hi i have been an artist for most of my life. 