There's a bolt hole in the front of the engine that intersects the pump pushrod hole. Put a long 3/8-16 bolt into that hole and GENTLY tighten it against the pushrod. Problem solved! There's a very short bolt installed into that hole to avoid oil leaks.
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!