I created a drawing of a rail with a slider on it. I created the slider as a solid and then put four holes in it using boolean diff. Everything looked fine so I saved the drawing. I now realize that the holes are wrong. If they needed to be bigger, I would just use another diff operation, but they need to be smaller. I wish I could just "undo" the operations and make the holes disappear, but since I've done a save, I can't. Is there a way remove or "fill in" the holes so I can start over without having to recreate the slider from scratch? I've included the drawing so you can see what I'm talking about.
Thanks,
Mark