Hi. So I'm learning how to use Autodesk Inventor and I need to complete a key holder (see attached images). I am stuck at the point where I have to put holes in the key holder so I can constrain the nobs to the plank. As it is rounded, I only have one linear line as a reference. I need to be able to click a line for reference 2, but there is nothing to click. I want to have the dividing line between the semi-circle and the rectangle as a reference. Please help! I have no idea how to word this, so sorry if it is hard to understand. It is not my own technical drawing, it's my teachers, but I'm on holidays so I can't ask for help from them. Plus, I need to have it done by the end of the holidays... :cry: