Very nice review! I got a 105 myself too, and have been quite happy with it.
Regarding the mention of the exposed needle tip, Badger does make a guarded spray regular: part# 41-043. It's originally from the 200NH brush, but they use a lot of the same components. I have no idea why they don't mention this in the 105's instructions. Just note that 41-043 is for the
medium tip/needle setup.
Looks like this:
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The trigger in the 105 been changed from the 360, which had a smaller diameter top with different texture:
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The old trigger is part #50-019, and there's also a rubber trigger pad, 50-087. However, to my knowledge, the old style trigger has been discontinued with a new style replacing it, using the same part number, so finding one could be a bit tricky. Never hurts to ask around, though.
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Has anybody tried this brush with the fine needle/nozzle combo?
I don't know how they make it nowadays, but my 105 (bought a few years ago) shipped with the fine neeelde/nozzle combo.
It could be that I had the 360 with its default medium needle/nozzle before getting the 105, but I didn't personally like the fine setup. Felt like I could get about as fine lines with the medium as with the fine setup, but with much less hassle. The doodling in the pic above is done with the medium setup.
To me, the medium needle/nozzle is more versatile and less picky regarding paint thinning ratios and the like.