What are all these metal cans/pods sitting on top of electronics?

One of the cheap tweaks I would use was to open up a cheap CD player and coat the inside walls and top with plumber’s putty. It would add about a kilo of weight to the CDP and dampen (reduce) the vibrations.

On most players it would make an immediately subtle, but noticeable, difference.

@spencem - I hope your vial holds a lot of those little suckers....  
At 0.000000000000000000000000223 kg each you might need to mass load your mass load.

@mitch2 
I'm very proud of how tightly they're packed.

@rushfan71....kilos are better, but...

See you shortly....;)

@spencem best solution and best answer. lol