allemander Try this.
Do you have any teflon tape you can put on the Lens part of the thred? (watch for the spring)
Anyway keeping in mind that it's a fine adjustment needed to get the beam/dot just right
To burn,you need it focused just right.
There is a chance that you might have receved a "dilda" that is bad, but it's rare, but like any laser there is always that chance.
If you have glasses (and you need them for 650Nm (red) at this power) it does help to get the "Dot" right for burning. and the best price i seen is ->
http://www.dragonlasers.com/catalog/Laser-Glasses-Red-laser-beam-protection-600-700nm-p-16422.html
Burn somethang black, like tape, or the box it came in
Most all of us on LPF have this laser (most of us have more the 1) so try this first and take you'r time.
keep in mind safty first, just because it doesnt "burn down the house" doesnt mean it's a toy.
And doin't worry, there are a lot of people that will help you IF <-- (key word) you do just a bit more homework first.---- > type ' dilda review ' in the search button above.
If that does not help ask > lasersbee < for a link to his review, it will answer alot. (only ask him after you tryed first).
Edit: Link below post #18