Timing distributer question

[benbuilder]

"Cranking clockwise from 12:00 to 10:30 is nearly one full revolution of the crankshaft,"
I was stating it incorrectly- i should have said 10:30-12:00. And, i was going backwards. so that play is not accurate. When i went clockwise from the front i noticed it was minimal.
For some reason when i took out the distributor to look around and reinstalled it, the play disappeared.
Maybe it was not seated properly before i stsarted.
I will try again today. thank you for the help