Ken, I have Meopta Opemus 5 (up to 6x6cm) enlarger who comes with 80mm lens as standard. Max. enlargments from 35mm negative in standard configuration is 18x24 cm(or 13x18cm, don't remember well, I didn't use standard configuration for 35mm long time...). So, if I want to make bigger enlargments from 35mm negative I use one of next three procedures: 50mm lens and turn lens into enlarger(lens goes into bellows, closer to negative)). 50mm lens and turning lens carrier upside down(lens carrier for my enlarger is conus shape, so lens comes closer to negative). Or 80mm lens and put enlarger on edge of desk, turn enlarger head 180 degrees and put paper easel on floor. Or fourth, I never used it, turn enlarger head 90 degrees for wall projection. Maybe to try something of this if your enlarger allowes you to...