Report "I have a daisey Powerline 880 BB rifle which will not pump up. It is not used much. Oiling the plunger does not help. I may have used solvent on it before putting it away the last time. Could that have caused damage. If I recall there was a foam like piece in front of the plunger which is not there now. But I'm not real sure of the anatomy of this gun. Do you have any suggestions? Thanks"