Its always tedious work when drilling holes in the skins. I made sure I took what Learned on the LH to this hole. Get your tank set where you really want it first...then drill the hole. I went ahead and moved to step #55 prior to completing this step. The holes were already in the root rib but I needed to open them up. All went well and I'm happy with the hole locations. I need to clean up the main fuel hole to make it look better but the clearances are good...now I just need to make it round!