Bill,
I discovered an issue when I was just playing around with it using water. The #3 worked, but the other two weren't working right, so I figured there was an issue and the closest thing I could pin it down to was the aircaps/heads.
Oldermodelguy, I agree I probably won't need the #5 for much. I figure for priming or some of the larger kits I have (I have a good selection of larger kits in my stash like the 1/128 Seaview, the 1/96 Constitution, the 1/48 B-1B, the 1/72 B-36, etc.) so I figured I would get it now and have it.
FWIW, the spousal unit got the airbrush in the original box for me through a thrift shop. When she gave it to me, the trigger was stuck and I knew it wouldn't work. Probably because the last time someone had used it, they never cleaned it. So the needle was welded to the airbrush by ancient, dried paint. An hour or so later after taking it apart and cleaning it (and a couple of Twilight Zone episodes for background), it worked fine with a low power compressor and water. So investing in parts to make it more utilitarian for me is not an issue.
Thanks for the quick responses, I appreciate it!
Doug