Mode Dial Snapped Off - Is it Possible to Replace / Repair Myself?

At some point when using my Canon 7D - the mode dial managed to be snapped off. I had been reading online that the piece itself is just plastic and that some owners had managed to get theirs replaced with a metal one - but these were all posted back in 2010.

I took it to a 3rd party repair shop and they quoted me nearly $400 for this piece! Does anyone know if this is standard? Is this something I could fix on my own?

The camera turns on fine and takes photos still - I just cant change the mode anymore...

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