Gave it another try this morning and was successful in getting the cap off. Used a syringe and tubing to refill the reservoir. What a PITA. Hopefully I won't have to do this again for a long time. I'll probably purchase the remote reservoir and install it over the winter along with the hydramat which I've discovered is necessary after some fuel starvation going around a long right hand sweeper with half a tank of gas! For now I'll try and keep the tank full and not push it in the sweepers. I need to break in my new engine and don't want to take the time to start tearing apart the car right now. Thanks for all the helpful suggestions.