I am in Austin too, and actually just sold my Spacedeck to another guy here in Austin, hwever I did not use a Spacearm.
I think your best bet would be Sound Mind Audio and Brian Kurtz, but he does charge for this service to those who haven't purchased their table from him.
Most others that I know who own a Spacedeck locally, actually do not use the Spacearm, don't own the table anymore, or had Brian set it up for them.
Also I assume you have seen the minimal set-up instruction on the distributor's website, but just in case.
http://www.aslgroup.com/nottingham/SpacedeckInstructions.pdf
But anyhow I would be willing to help you out as much as I can, drop me an email if want.