It will NOT fit through the hole on the DX. You have to pull the cap off in order to get to it. To do that take a peice of wood. Drill a hole in it the same size as the laser head. take that peice of wood and cut it in half through the center of the circle. Now place the two peices of wood around the laser cap and put the wood in a vice to hold it still. with it tightened you can now pull and twist the cap off. If you cannot, use a pair of pliers with a rubber band around the laser and hold onto the laser the rubber bands under the pliers and spin twist.
I can't find the link for the MICROpro lens pen - I did find the MINIpro link fine. Watching the cleaning video and looking at the pictures it appears the MICRO lenspen is different than the MINI... where's the link to it?
Yay - I found a local camera company the sells nearly all the lenspen products, including the micro. It was cheaper than the online price also. I try to support local companies if I can. You definitely want the micro lenspen for cleaning lasers - even then the tip may be too large for some lasers.
It works like a champ - those nanite carbon cleaning particles do the trick - no tissue or lens cleaners, which often leaves behind a residue. Earlier I'd attempted to clean the diode cans window on one of my pointers and ended up making the scatter worse - it had a really bad halo of speckle around the spot. I just couldn't get rid of it using lens paper. Using the lens pen I was able to effectively clean the diode's window and get rid of nearly all the scatter.