Thanks dpollo. That is what I ended up doing, except without the screwdriver. Just sort of manhandled it and pop, they came off. I had only tried the driver's side before posting and it was much more stuck than the passenger that came off really easy. Strangely, the passenger side 'bearings' were frozen. Took a bit of time, effort, and lubrication to get them moving smoothly again. Everything is back together and it sort of works -- I think I need more vacuum. This car has a combination fuel pump / vacuum pump, but in the driveway it wasn't moving the wipers by itself -- a little manual lift on the arms and they would move and come back (on occasion). Hopefully I'll get more vacuum when on the road. Next up to fix is the brake lights.