As the topic says i am a new person needing help with solid works.

I have only been using it for a day or so and i got a grasp of the basics now and thought i would try and model something kinda simle that i thought i could do.

So i grabbed the thing closest to me and it happened to be the firing bolt out of my paintball marker.

Anyway i got what i consider something pretty good after a few hr's and was pretty happy with my first modeling attempt.

But there is one thing left to do and i can not for the life of me work it out.

I need to make an elliptical type shape dent in the side of it. I need it to gradually get deeper as it goes backwards along the bolt.

Any help[ with this would be great. If there is a tutorial that you know of that you could point me to or explain to me how to do it would be fantastic.

I have added a pic to try and show you what i mean.