Hi Jostber, As a house painter I sometimes have jobs of converting wood stained kitchen cabinets to being painted. On every opening door or drawer I put on these little felt bumpers that every hardware store carries. They go on the 2 corners of the inside door and are self adhesive. They dampen the door sound shutting and prevent paint from being chipped off.
I tried these bumpers on an old AR-XA and a Technics SL-20 and they work great. I'm sure Herbies devices are better but while your waiting it might be a fun 3.99 project while you wait. You get 75 of these little felt adhesive round dots so if you lose one? They leave no sticky residue either and they come in a dark color to sort of act un-noticed in the dust cover.
There are probably a large group that don't want you to play a record with the turntables dust cover on in the belief that why dampen something that does not have to be there. But I say when you the brightest sun coming thru your window some day look at all that dust flying around. You'll wonder why you made such an effort to clean your record....take care...Mark Korda