I've made mayo 3X now using my own eggs. First try came out great and lasted for weeks in the fridge. 2nd try never set up and was watery even after refrigerating. #3 started out good but after a couple days it broke in the fridge and is too loose to call mayo anymore. Still tastes good but not spreadable. So what am I doing wrong? I don't have a food processor or immersion/stick blender (I covet the latter) and am using my blender.