The text manual, rudder section, says “4. Bolt the rudder horn mount tube to the spar“. Since the holes in the spar are not sized for the bolts, it seems obvious they need to be drilled. However, there is a hold slightly higher up the spar and off-center that is the same size as the bolts, so I know the CNC machine can make a hole that size. Since the machine can make holes that size and did not do so for the rudder horn mount, and there is no mention of drilling these holes, I wanted to confirm that this is the process.
I assume there are probably lots of places that need drilled to size where that isn’t called out, but since I have seen it called out in a number of other places, the fact that drilling was not called out in or prior to step 4, I decided I better check since I am just getting started and don’t want to screw up at the outset. 😁