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Chaps
I've just run up a quick tutorial on how to change your Iwata CR from a 0.5mm to a 0.3mm needle / nozzle setup.


You will need the 0.3mm kit from John and some bees wax:




Remove the 0.5mm Needle Cap, Nozzle Cap, Needle and Nozzle (these can be put aside for later conversion back to a 0.5mm if need be). Then remove the Trigger and Needle Chucking Guide:



At this point you may want to give the brush a good clean.

Now the tricky bit, you have to "Nip up" the packing screw a little. This is the advise given by The Airbrush Co. You can actually get a new 0.3mm Needle Packing Set if you like. I may do this myself, I'm not sure tightening up the screw will have a good long term affect on the Teflon seal. If you look into the rear of the brush (from the handle end) you'll see the flat head screw:




I had to turn mine clockwise about 1/4 a turn. Try adjusting then put the needle in (lightly oil with SuperLube first), you need to feel a little friction when the needle passes through the Teflon seal. This took me about 5 mins to get it just right.

When you are happy with that you can then put the brush back together. I start with the Trigger (note, there is a cut out in the Trigger, this faces the rear of the brush) and Needle Chucking Guide parts then the needle (smear the needle with a little SuperLube first), this I put in from the front and then slide it back until you can see the tip in the paint cup, this avoids any possible damaged to the tip when fitting the Nozzle. I then put the nozzle on, this is where the bees wax comes in. Smear a little on the thread and then screw into place. Hand tight is fine. The wax stops you getting bubbles in the paint pot.



Next put the Nozzle Cap and Needle Cap back on, I use a little wax on these threads too.








The last thing to do is slide the needle all the way home and replace the handle.
I suggest you do a dry run now to see if everything runs smoothly, then give the brush a good run through with cleaner to get rid of any surplus wax etc.
Don't forget to give the outside a nice polish too!




Hope this helps.
Rick.
PS. Sorry about my reflection in some of the shots, I used the studio gear set-up from the last job!

Right, I've updated the tutorial a bit. I hope it'll not cause anymore confusion.
Just a quick comment though, this is how to replace the .5 with the .3, not a general guide on how to rebuild your brush, we may all have our own ideas on that!