Did you know that you can find the distance from a drilled hole in a solid model to the end of the straight in VTube-STEP? You can also use the collect feature to find the diameter of the drilled hole.
STEP 1 - Import the STEP model. STEP 2 - Collect the hole as a single straight, then rebuild the parametric tube from the collection. The result is the centerline of the hole and the diameter. STEP 3 - Next, collect the straight that the hole is drilled in as a second cylinder and rebuild the parametrics again. When VTube asks it if should fix the negative straight, press "No." STEP 4 - Set the radius to a very small positive value (like 0.0001) and press F2. STEP 5 - Read the length value in the LRA chart. This value is good for any tube orientation - not just tubes that are flat to the world system.