Why are my woofers pumping?

Conclusion so far - maybe, just, live with it, until the next cart change.
Facts:
- Pumping carried over to the secondary system - clearly not amp or speaker dependent (digital LP recordings).
- Arm bearing, turntable, drive, belts etc - no indication of misbehaviour
- Maybe the leeway in the Hanss bearing plays a role, I will know soon when I get the tool to tighten it (i doubt it makes much of a diff, based on testing so far) - including: if the Hanss misbehaves, why do I see pumping also on my VPI HW19 recordings - ?
- Getting a balanced filter seems difficult. E g the KAB single ended filter would need an extra box. This combo (or cludge) would probably not be good for sound quality, compared to direct balanced.
- I suspect that a rumble filter, properly installed (in the phono stage) might help my sound.
- I see woofer pumping clealry before or between the music tracks on the LP, with the stylus in the groove. This goes on more or less, depending on the LP. The pumping is clearly related to the revolution of the record, it repeats once per cycle.
- When the music is playing and the stylus in working within the music track, I don’t see much pumping. I suspect that this is because the woofer is now in the grip of the musical energetic vibrations.
- However, it may be that the woofers are still made to "work" down below in ways not optimal to the sound. In simple terms, more stress, less peace. Not sure.
- I have a feeling that woofer pumping is related to more listening fatigue. But I am not sure. Testing different records, I also find a bit of the opposite rule - pumping is related to good, involving sound.
- If I had serious "underlying pumping problems" with analog/vinyl, I would have selected the digital source, in my system (since digital music shows no pumping). Yet that’s not the case. Digital music sounds much poorer in my system. More harsh and flat - and not much more "peaceful". Although this may also be due to the fact that my analog chain is better than my digital chain.

Back testing my cottage system playing SACDs. System is good enough to show the considerable step up from CD sound. Almost as good as my vinyl rips. And like before - with digital sources i see no pumping.

Back home testing woofer pumping on Pink Floyd: The Wall, the dreaded thing happens, my neighbour (house is vertically divided) rings my door bell and asks me to turn it down PLEASE. It happened after I played the "shotgun" drum/bass effects in the intro - "there were certain teachers"...Another brick in the wall. Volume close to the wall to the neighbour maybe 92db.
Since it was early evening, not late at night, I went over to him, rang his door bell, and protested. They have lived there for 4-5 years and not complained before. The dividing wall is sturdy cement you took away some isolation. Etc. But - well - I guess, no more woofer testing, at the moment.
I HATE the feeling that my music "bothers" someone else - don't know about you.
 

Just as a FWIW- the digital recordings you made may not have the subsonic information that is pumping your woofers, so I would not use such recordings as the results might be inconclusive.
Have you tried greasing the platter bearing yet?

Atmasphere - thanks for hanging on, what would A-gon do without such good advisors.

Today I received the millimeter version tool that should help tighten the housing of the Hanss bearing. When I get my friend over we will turn the whole heavy player on its side and then try to tighten it. We will also give the bearing a bit more oil - this should be just thin "sewing machine oil", says some audo importers over here - Hanss does not specify.

My suspicion is: it won't make much of a difference. But we'll see.