Kalita Style 103 Plastic Coffee Dripper - Clear

It would be perfect if the diameter of the base that sits over cup were slightly bigger. My favorite coffee cups have a rim that is just under 4" across. This Kalita style 103 plastic coffee dripper won't fit across, leaving it too unstable to use with those cups. Have to use a different cup than I'd rather every time I make coffee now. Would be such an easy fix just by having that model be 1/4 a 1/2" larger across where it sits on the rim.