Here's the machine we used yesterday to needletine aerate the entire back 9. You can see how thin, but long, the tines are.
Here's how the green looks immediately following a pass made by the machine. It's hard to tell in the photo, but that flag sits about 4 1/2" deep in the aeration hole.
We immediately follow the aeration with a quick roll of the green and the surface looks like above. The holes are still there, but hardly noticeable, with virtually no disruption to the playability of the surface.
The front 9 will be completed within the next week and we will continue to use practices such as these to help improve the growth and health of the greens through the summer. I look forward to the day we only have to water the greens once a week because the roots are so deep, and we can keep the surface firmer and faster.