Adjustable glass bed corner bracket

Corner bracket for a glass bed on a Makerbot Replicator 2 and its clones. This bracket is designed for a 1/4" glass plate but *could* be used for something thinner.

Any tips/tricks on how to use or improve the design, feel free to post a comment! Feed back is greatly appreciated.

[Update 8/28/2016] I added a version without the adjustment slot.