Replicator Mini - Build plate support tougher version

This is not my idea idea, I just adapted it to my liking and...
Well, share with people like he was kind enough to do so before me.

Remix of: http://www.thingiverse.com/thing:615358
By: muzz64

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The original design was good, a bit wide in the locking part but good. Until I found that on my machine the support would eventually slip from side to side and doesn't support the very end of the build plate.

If I was going to put a support underneath, I wanted it as tough as I