A8 Glass Bed Corner Holder

I got a glass plate for the heated bed of my anet A8.
The heated bed is 22cm, while the glass is only 21.5 cm.
So I designed some corners.
I got inspired by this ( http://www.thingiverse.com/thing:2122339 ).

At the bottom there is a washer for the springs included.

I printed the corners with PLA (as I havn't tried ABS yet).
The corners are a pretty tight fit for the glass (see pictures), so I had to heat up the bed to 75°C before I could squeeze in the glass.