The Great Hole Alignment Tool didn't quite live up to par, and the uprights (vertical poles) of the Schutzhund jump need to be redone:
The problem is obvious: The jig is drifting from side to side as I make the holes, so I attached two cedar blocks on either side cut to an exact height:
The resulting alignment should now work:
Tomorrow I'll do the curtain scoot prop. This will require them to scoot under a vertically hanging 3x5 foot flag, the height of which is adjustable. The holes to adjust the height will need the jig above.
Thanks for reading!