I have two options (both made by my local metal fabricator) for mounting my laser(s) on to the stand.
Option 1.
This is a basic 'T' bar and the lasers hang each side of the 'T'
Option 2.
This I use when i'm using just one laser, it's basically a 'U' section. The bottom of the 'U' mounts into the upright of the stand, thus it can swivel on it's horizontal axis. The laser sits in the top of the 'U', at each side there are slots where the bolts that usually hold the hanging mount on the projector are placed, this allows for vertical movement. Once it's all tightend up it's as solid as a rock.
I note what Mark says about using one stand. However, the Powerdrive base opens pretty wide and that makes it very stable, it's never caused me a problem at all.
Cheers
Jem
Quote: "There is a theory which states that if ever, for any reason, anyone discovers what exactly the Universe is for and why it is here it will instantly disappear and be replaced by something even more bizarre and inexplicable. There is another that states that this has already happened.”... Douglas Adams 1952 - 2001