Has anyone had to change their wheels yet. I've been trying to find replacement wheels for the Patty but everything I buy is too wide. I've tried the Dave Brown 4" Lite Wheels, the Sullivan Skylite and they are both too wide for the pants. I've tried Hobico Support and they tell me that there is no replacement wheels within their system as of yet. So, if anyone knows what kind of 4" wheel that are about 1 1/8" wide, please let me know.