Oil pump drive gear stuck

AJ/FormS said
Sometimes/ often, the engine has to be rotated to get the hex to engage the pump, before the drive will drop in.
But I agree with Plymouth65. That bushing if new, is supposed to be reamed to fit the drive, after being installed. If this is not done, then the drive also may not engage the cam, so now you could have a total of up to three problems.

I rotated the drive gear so wouldn't that be like rotating engine? Bushing looks new. So I need to pull the intake, tap the drive gear out, then probably ream the bushing? Sounds like at best brass particles get in my oil. Is there a tool for reaming the bushing?