FreeCAD Hole Size Tuning

My current FreeCAD model is almost finished, yet I still need precise dimensional work on the hole features. All other aspects behave as intended; only the hole sizes must be adjusted so the final part matches the required tolerances... (Budget: $30 - $250 USD, Jobs: 3D Animation, 3D Architecture, 3D CAD, 3D Design, 3D Drafting, 3D Graphic Design, 3D Modelling, 3D Rendering, 3D Visualization, CAD/CAM)