Ed, is that for the 503? I believe I can fabricate or adapt the parts needed to rebuild that pump, especially if you have a spare unit I can tinker with without taking the big rig out of service. PM or email me if you'd like to discuss it.
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!