Arena Assembly, Overpass ... DWG Error?

[Ziaholic]

I'm not 100% sure where to post this question, and I searched around to see if anybody has noticed this yet ... no luck ... so it's going here ...

We're assembling the overpass assembly per the official dwg's found here

On page 4 of 19, there's an assembly note for item 13 in the lower center section. It's for the insert that will tie the overpass sections together. (to couple parts 04 and 05 on pg1)

The note says to turn down one half of the 12" piece ... but that doesn't make sense if both ends of this piece are going to fit inside the section pieces of the overpass.

We are actually not building this piece per the dwg. Instead, we found a smaller diameter piece of pipe that we will use to couple the sections together, without a need to turn it down to the smaller diameter.

Are any of you building an overpass? Have you built this piece yet? Is this a drawing error, or am I missing something. It's not holding us up ... but it's bugging me ... either I'm missing something, or it's a drawing error.

Thanks.