i just did this in my free (vacation) time.
It is my first try to build something that can be printed out by a 3D printer so if you have tips or enhancements: let me know.
I have not yet printed it (lacks a printer atm), but i messured very strict (hopefully strict enough).
Please don't blame me, if it doesn't fit - instead tell me what was wrong
Here's the "thing":
http://www.thingiverse.com/thing:68882
regards,
Deadpixel