That's something you'll need to experiment with.
Use a fine stone in your Dremel and round over the point where the cocking piece rides over to go into it's parking space.

It can't be flattened out because it won't hold the cocking piece when it needs to. Leave enough meat there for it to ride over smoothly. Polish with some 600.
Also, look at the cocking ramp with a magnifying glass. I had one that actually looked like a washboard.
Again, with a fine stone on the dremel, a little 600 and polish it with a cotton wheel & jewelers rouge. Dremel makes a polishing wheel kit with a couple cotton wheels and a small container of rouge.
Takes a little practice and if you grind off too much you can always grind the notch a little deeper to start over.

I'll try to remember to shoot a pic of mine. Gear's packed up & ready to head out for a day of shooting.