Go to the local home store and buy an iron pipe nipple as a driver. About $2.00
I FINALLY listened and found that the lower rubber seal can be stretched and removed. That leaves enough room to get a flat bar in there to pry, the top of the fork stop nobs make good leverage points, and once it's up a little you can tap with a driver at the front, around and around you go, time and patience will bring it off.