Solution for M21 & (M18 ??)
Take 2 pieces of wood 1.5" X 1.5" X 6 to 8" and place in the holes in the floor. Put table on top. Slide will now close over table. If you cut the wood (1.5 X1.5") too small, just wrap duct tape around the wood until there is a snug fit. None
DO NOT JAM WOOD INTO OPENING AS YOU MAY DAMAGE RETAINING HOLE.
(the 6-8" can be any length as long as it miss the slide when you close it.)
Take a cardboard box that is Approx. 3" X 5-7" X 5 - 8".
Cut 2 holes 2" X 2" on the 3" by 5" side. Holes should be about 1" apart.
Do the same on the opposite side matching up the openings.
Only cut the 2X2 hole on 3 sides. The 2X2 flap keeps the legs from excessive sliding.
Put legs into holes and place on floor out of way.None