Trex v2 tail build question

[icewing]

Hi all, I am working on my first build and have a question that I can't find an answer to.
The tail boom has slots cut into it to assure that it sits correctly in the block, but the end of the boom that I am to attach the rear rotor has only a single hole.
How am I suppose to line up the tail rotor housing on the boom? Should I just eyeball it? It just seems that with such a precise machine, I would have to be sure it was dead on before I went for any final setup. Also, what is the hole for?
I read everything I could find but no one else seemed to have this question and I just want to be sure.
One thing I did notice was that some folks were having trouble feeding the belt through the boom. I thought I would share my solution to this problem. What I did was grab my fishing rod and feed the line through the boom with a leader attached. Then I just hooked the swivel to the belt and presto.
Anyway any help at all with the line up would be great. Thanks all.

[Skarn]

I eyballed it. Then felt like you thinking there had to be a more precise way so I got a level out and put the vertical stabilizer fin flush with the vertical level. You don't need a level, just something squared.

Skarn

[ChasHeliCop]

Eyeball the tail case with the boom block to make it level. The hole in the end of the boom is for the plastic tail case, which has a post inside to align (no pun intended) with the hole.

[Skiddz]

I just eyeball it.

Compressed air will shoot the belt through the boom in about 3 nanoseconds. :)

[icewing]

Thanks gang, I will line her up as best I can.