Never mind. You are probably talking about changing power, not connecting the atty. if so...carry on!
It is still a valid point. Yes there is a rotational wheel for adjusting power level, but the first VTR's out the gate - unofficially called version 1 - also had a rotating wheel at the base where you screw in the atty. This would rotate your atty, which really isn't necessary for positioning most drip tips, and definitely not needed if you are using the iClear 30 S that comes with it - as the drip tip itself rotates (I really like to 30 S too btw, it is very efficient at keeping the coils in contact with juice so you almost never get "dry hits").
Anyway, the bottom rotating wheel made the connection threading wear out fairly quickly. So you should ask if the stock you are considering purchasing on-line, particularly if it is at a discounted price, is the version 1 or 2. I bought mine the moment they became available in Canada so mine was a version 1. Innokin replaced it free of charge, however, I had to pay to ship it to Wilmington North Carolina and went into "VTR withdrawal" for the weeks it took get there (via ground courier ~ $25), the VTR in it's little "road case" weighs about 2 lbs) and get sent back to me.