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Wow, this is pretty incredible. I had one of those break mid LP just three weeks ago! The racket of the pump housing vibrating against the mounting plate was something! After I determined the source of the racket, another one broke. I turned it upside down and placed it on a stack of soft fabric for the time being. If I find replacements, I will let you know. You may want to ask this question in the ET2 tonearm thread. Someone there might know where to get replacements.
If the OP's pump is like mine, the rubber pieces are o-rings. It's just a matter of finding the right size. I have a pretty good local o-rings source, so I will see what I can find. This is what the bottom of mine looks like.
Mine was different. It had 4 holes to accept some sort of rubber feet. Thanks for pointing this out.
Upon thinking about it, the 4 holes in the metal frame that are present in your picture....This is where I placed the rubber isolators I found as this part of the structure is lower and is what comes into contact with whatever the unit is placed on. My unit had the O-rings but they were clear and had not broken down. The O-rings allow for the unit to be isolated from the frame structure.
My WISA pump looks very similar to the one in the web link above. I am looking for the four green O-rings.I just came back from ACE hardware. In the plumbing section they have 3/4 x 9/16 x 3/32 #11 O-ring. from DANCO Inc.I tried on my pump. A bit too noise and an option is everything else fails. Thank you.
I don't know if the green ones in the pic above are original or not because mine were also clear (slightly yellowed from age).
I went to my Sears Hardware and tried 3/4 x 9/16 x 3/32 o-rings, but the weight of the pump caused it to contact the mounting base:
I then tried 7/16 x 11/16 x 1/8 and it looks perfect. Notice the gap between the base and the pump:
Noise/vibration seems the same or less than with the original o-rings. I'm not surprised since the originals were pretty hard and did not return to a round shape when removed.
dcaudio, I'd buy a set and ship them to you, but they have less than four left! Let me know if you don't have any luck and I can check back later to see if they re-stock. They are pretty bad about restocking, though. You can also try McMaster Carr. They have a huge selection of different materials in this size.