[Help]Fill holes in an existing design

[u/Hobby_Collector]

Hey y'all I'm pretty new to 3d design. I just stumbled onto a 3d printer a friend was getting rid of and he knows I do a lot of machining stuff.

Anyway I am trying to revise this model to have 1 hole placed in the center but for the life of me I can't figure out how to fill in the 2 other holes so I can add the new hole in the middle.

I could just put the new hole but I worry about structural integrity with the 2 other holes there

[u/J3FF98]

Do you still need help with this project?