Lower window sills

[husdj]

Hello
I'm going to change the wooden facade on my combined wood and brick facade. One problem / construction fault is that the window sill tilts inward towards the window, (see picture). How do you fix this? If I raise the window sill, it will end up level with the window itself, and I don't want that. The only solution I can think of is to cut/grind down the upper part of the brick facade a bit. Does anyone have a suggestion for a suitable tool to use for this? I want to avoid the bricks cracking, etc.

 

[GoForIt]

Possibly a concrete grinder would work, but that assumes the stones are firmly attached.

 

[husdj]

Okay, should it be a specific grinding disc, like koromant or similar?