[kagaos]

How could you fix small grooves? Do you mean, like the grooves are actually cut out, or it is just bent, and you need to bend it back?

 

[kagaos]

Oh, I see what you mean. OK, well yeah filing (file+ing) them down is good for kinda big grooves. But for the big ones, I would either get a new heatsink, or cut it off, and file it down to a smooth flat surface.