It is a remote amp controller, just like a foot pedal, but it is not wireless. I have mine hooked up to an old Miller 250 DX that I bought before inverters came on the market. The frame that I am working on is about 12" off the ground so I am crawling around on hands and knees to weld brackets in place. I have been using the button exclusively, so much better than a knee or elbow on the pedal.
I know what you're saying but at the moment I'm not too sure what I can do. The drive lines in our other two T-buckets are pretty crooked also and they have survived, but I know that isn't the correct idea.
Yes, from side to side. It comes in very handy for one person working alone.
Referring to the potentially crooked drive line or to this?
Next I spring clamped the Formica into the back side of the shell. 
The last thing was to start putting layers of fiberglass mat onto the Formica backer. 
After I have enough layers of mat to reach the desired thickness I will add one layer of glass on the front and back to hold everything together.
It flairs good too.
