How many Mopar owners does it take to screw in a distributor?

Doing what i do I get some stuff that you just want to laugh at the person. Best was a guy with a big dollar hemi build. I get the call I have a distributor that needs to be rebuilt. OK no prob send it to me. I have two more also I will send. Holy crap he has three of them $$$ distributors. So, I get them two are NOS in the box one needs a rebuild, just checked out the nos and left them alone and rebuilt the one that was needed. Send them back and around 6 months later he calls all pissed off. What did you do to my distributors I just got the motor back in the car and put them all in and cranked and cranked and the do not turn! The shafts are too short. WTF right. I ask him to take a pic of the hole with the distributor out he does and guess what no oil pump drive. He was not happy when I told him the builder never put it in and now you have to take the motor apart since you cranked it so long without oil pressure. Never heard another word.