Watch this one
http://www.thingiverse.com/thing:877810

I am working into a Pin wich actually holds a mirror to a heat bed, tested and it simply works, it is not perfect but we wanted to use a pin to save space for our Prusa box design, and it makes its job.

WARN
At the moment it does not work so fine as expected, with use it gets loose, and also some 3d print failed because it didn't made any force, but I am near to finish a small clip to replace it, 3dprint clip.

At the moment you see it, some ideas start to flow, right?