Light score marks on the base plate can be lapped away using a piece of plate glass, 400 grit wet/dry sandpaper and motor oil. Use a figure 8 motion and keep polishing until the score marks are gone. A new pump is a much better idea.
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!