stacking components without leaving marks

as we all can see on audiogon, this is not as easy as it first appears. has anyone found a good solution (DIY or commercial) that can go under the feet of a component LONG TERM that can allow it to be safely stacked on another component? something that wont scratch or discolor the bottom component?
you may want to try felt pads at BB&B. There cheap and should protect without leaving any unnecessary marks.
I use felt sheets from Hobby Lobby, 4/$1.
I cut some paper up. Free. Didn't seem detrimental to the sound at all.
Yeah. get some acid free paper preferably. But any old paper will do.
I tend to use Post it notes cut to the shape of the footer.
It's best not to stack components for more than one reason.
Paper works. I assume that you are going to use stock rubber feet. I stock components too, but I use different feet under each component; the difference in sound when using good feet is quite big.
Every shelf in my main audio rack has a pair or even three componets stacked. There is NO reason not to stack components IF they:
Do not radiate: too much heat or too much EMR.(electromagnetic radiation)
There are no other reasons, other than looks.
Usually tube amplifiers and tube integrated are the too much heat. Class "A" running solid state amps too.
Everything else is fine. I tend to keep the Phono away from the Digital, but that is just me.
Added: No stacking was invented by the folks who make or sell component racks for a living
Felt pads for furniture works. But I do like Lizs comment.

BTW... Don't recording studios stack most of the equipment.
Elizabeth, Not true. When you stack components you are mass loading the component on the bottom which will affect the sound.
Felt pads for furniture works. But I do like Lizs comment.

BTW... Don't recording studios stack most of the equipment.
Yeah, mass loading, so i use the component on top instead of spending another few hundred to buy some fancy gizmo claiming to be the best for mass loading, blah blah blah..
Though i own several VPI bricks I got dirt cheap (as in free, and $15 each for two more...)
Patio bricks are good for mass loading. Just glue some card to the bottom so they do not scratch up your stuff.
I loved using a zigzag shaped brick on my prior amp. A Forte 4a.
I use round (with a little crescent cut out) 5" diameter 3" tall patio bricks under my turntables. Eight patio bricks help keep the whole rack stable.
Elizabeth, this is not that simple. You forgot vibration. Rack can make it better or worse. I experimented a little with various feet and cones. So on the bottom of my "stack rack" is a MDF platform, soon to be replaced with something else when I figure out or guess which one would be better, that sits on four Mapleshade Isoblocks 2, then Acoustech phono stage is on the platform with 3 1.5" Audiopoints under it, then Nakamichi deck is on top of it with three Polycrystal feet under it, and finally Audiolab integrated is on top of everything with three Boston Audio Tuneblocks under it. The whole thing is on hardwood floor.
Turntable and CD player are separated from this and each other.
Deck gives the most vibration, but of course I never use it at the same time as the phono stage. When I make recordings, not too often, I disassemble my pyramid and everything is separated; I also unplug all the equipment except what I use for that and monitor the recordings through the deck's headphone jack.
I used cheap racks before and it was much worse than what I have now.
I used to have a 70 pound concrete patio circle i used as a base for a stacked pile of components. Under the painted patio slabwere TipToes. Then the stack of sstuff with the amp near the speakers.
hat was a nice setup.
I now have racks from a 'big box'store i filled the tubes with playbox sand. Due to the tempered glass shelves, i use butyl rubber bottle stoppers a lot. Size ten.
I like the rack I now own, andsince i paid only about $150 each for them, they area great deal for the cheapskate i am.
I have two TVstyle racks, and one tall one. One TVstyle has the Plazma TVand the receiver, and the DVD players, then the other TV style rack has the two turntables on it. The tall rack has my two channel stuff, with the amp over by the speakers.
almost forgot about this thread, wow what a lot of comments! thanx guys! i was always under the assumption that felt left marks, i will get some.
Plastic wrap works well. I use circular sorbothane pads in place of, or underneath, the feet of some components and apply a piece of plastic wrap to each side of the pads, then loosely trim to fit with scissors. It sticks to the sorbothane so it's easy to adjust the position of the pad and the sorbothane is a good isolation medium.