Click noise after key release...normal?

[prometheusdt]

I'm new to piano and bought my first used grand. In the video above, after I release the key, the damper falls and you can hear a clicking noise (you'll need to turn up the volume). Is this normal? I hear this at my piano teacher's place as well, but his was much quieter and barely noticeable. My sister's upright didn't make as much noise as mine either. Mine is loud enough that it's distracting. When I play very loudly, it's not as much a concern since the music drowns out the clicks. But when I play at moderate loudness, it's noticeable. Thank you in advance for your response.

[richard black]

Shouldn't happen, but it's a pretty standard fault on quite a few modern pianos, especially Bostons. Most often caused by screws that have worked loose. If so, it's very easy to fix - just take out the action and tighten the big screws holding the action to the various rails. You'll soon find out which ones are loose.

[prometheusdt]

I pulled out the action (my very first time doing it). Good news: the piano didn't blow up. Bad news: it's still making the same sound. I tightened all of the screws for the hammer rail; it didn't need much tightening, only about 1/16 of a turn each. Still making the same clicking noise. Below is the new video of hammer with the action pulled out (make sure you turn your volume way up). What do you guys make of it?

[indyraven]

I'm not 100% sure there is anything here you can fix.  Being it sounds pretty uniform across the keys you pressed this may just be the character of your piano's action.  Regardless, I don't think this is going to be something you are going to want to try to address on your own.  The person who possibly could help you is your piano tuner.  Or at the very least he could point you towards someone trained in regulating grand piano actions.  Grand actions have a TON of adjustments that depend on other adjustments that depend on others....  if you change one thing without taking into account the other settings things can get messy pretty quickly. 
Please, don't take this as a ding against your abilities.  I'm just trying to save you frustration.

[prometheusdt]

After doing a bunch of research, I found out that the problem is the felt for the jack regulating button is too hard. I found this youtube video (

) of someone else having the exact problem, as well as this thread (https://www.pianoworld.com/forum/ubbthre ... 0clic.html) with another person having this issue.

Other people have pointed out that my hammer rest rail should not be touching the shank. The blow distance is 46 mm, which I assume is the correct distance. I lowered the hammer rest rail so that it is 2-3 mm below the hammer at rest. That didn't have any effect on the click noise. I then took a couple small screw drivers and "fluffed" up the felt on the jack regulating button. This youtube video (

) is the result of a fluffed vs unfluffed felt. As always, please turn your volume way up (the volume in the video doesn't do it justice..I wish I had a better microphone on my phone for you guys). In person, there's a stark difference between the two.

The problem with the fluffing is that after about 15 minutes, the old clicking noise returns. Some people have recommended needling the felt, but I'm worried that it's only a temporary solution for a few months. At the moment, I'm considering replacing the felt with brand new high quality felt so this problem wouldn't come back for years. I spoke to a piano technician that my teacher uses and he seems reluctant on doing this since it's a lot of work, as well as being skeptical about the cause of the noise like you are. I sent him the video above but he has not responded yet.

If my assessment of all of this is wrong and you still think it has nothing to do with the jack regulating button, please be completely honest...my feelings won't get hurt. Besides the clicking noise, the piano sounds great, and if the problem/solution doesn't require the technician to remove the hammer and re-index it later, then I'm all for it.