Flashforge 1/4 inch glassbed corner holders

I changed the design of http://www.thingiverse.com/thing:613685 just a little, thank you jherridge for coming up with this. The original design was great but I wanted to be able to use the original bolts on the bottom of the heat bed to tighten very similar to the way the bed leveling screws are assembled. The original designs slots for adjusting the bolts was very large and I wanted a tighter fit. I reduced the size of the bottom and made it a couple of mm taller thus reducing the size of the g