Good advice. I also have a 532 303 and despite focusing it refuses to burn anything. Quality and output varies from a unit to unit...sounds like we ended up with duds.Did you adjusted the focus? Most of 303 lasers are capable of burning, unless you received a true low power one or a defective one.
You can try to paint the match with a black pencil, adjust the focus twisting the cap, turn it on and point it to the match head, firstly put it near the aperture, and slowly move it away, at some point the match should burn.