Which Countersink Bit?
This past weekend I finally arrived at the step where the top skins over the inboard rib are countersunk to accept a dimple for a #8 screw. For those of you long past this step, or not there yet, the nutplates are installed earlier so this is the first time in the build where a countersink is required AFTER the nutplate is already there. No problem (I thought). I pulled out my countersink bit that specifically said it was for #8 screws, but I quickly discovered that the pilot (the little nub at the point) was too big to fit down into the nutplate threads and therefore I was unable to countersink as deep as is required. Does anyone know what size pilot will fit in these #8 screw nutplates (i.e. MS21051-L08 and K1000-08)? The bit that I was trying to use has a #21 pilot, so I already know that is too big. Will a #30 fit?
Empennage Complete Except for Tips