This is a remix of Udo's thing. My washers are smaller (https://www.bauhaus.info/unterlegscheiben-dichtungsringe/profi-depot-bauscheibe-vz/p/20167499). I changed the geometry to a tighter fit so the washers (especially the top washer) don't rattle. With two washers the weight is 140g. One washer costs 0,50€.
https://a360.co/2KxNeEs