I realize this is an older thread but this seems like the appropriate place to post. This is what I ended up doing for my egg crate frag rack. I cut short sections of 0.5” diameter acrylic rods then cut a cross on one end that fits snug into the egg crate. I was planning on gluing the risers but they seem to snap right into place so I might skip the glue. These seem sturdy enough for the height I’m using but I’m not sure what the max height would be for someone who wanted a frag rack raised up higher.