Can any of you DIY's PLEASE tell where I can get the rubber washers for a Flexi Rack I'm planning on building? I'm using 5/8"-11 threaded rod and hardware, painted black. I'm using 5/4" MDF for the top and bottom shelves with black #909 Polished Formica® Laminate finish. These will sandwich 5 smoked 1/4" Tempered glass shelves. I have black casters from Salamader that screw right onto the rods. I have all the materials I need EXCEPT the darn rubber washers. They are a critical part of the glass shelf assembly. The od is 1-3/4", the id is 5/8" and at least 1/8" thick, black of course. Someone please help! Thanx in advance, Roly.