I'm trying to create what is essentially a cylinder with a hole of a very specific shape cut out of the back of it. I could have tried taking the cylinder and object-subtracting something from it, but getting said something into exactly the right shape would be nigh-impossible, as far as I know, because it needs to have two lines of symmetry. Now, I thought perhaps I could cut the cylinder into quarters, and point-edit the shape in, but now I have four quarters of a cut-up cylinder and I don't know how to combine them. Solid Union either gives me an error message or spazzes out whenever I try to use it. Gluing is insufficient, because it gives me bad lighting. I also need to connect a hemisphere to the front of the cylinder, which has been equally problematic. Any ideas?
