Scooter,
This will explain why/how the 'Off-set' is needed,
>
http://www.skyandtelescope.com/howto/diy/3306996.html
This is what is built-in to my 10" Dob by Meade.
Collimation is just a tad out on this old pic.
Slight adjustment of Primary was all it needed to get all concentric.
It 'doesn't look right' if viewed through focuser tube but star test is 'spot on'.