Watching now. Its blowing my mind that you did your sight window on the end of your edge sander and a pneumatic disk sander. I'm gonna have to get one of those. I spend a lot of time with a ferriers rasp, half round file and palm sander. that thing seems like a cheat code.
Kirk, I came up with this little fixture to hold my palm sander that let's me put two hands on the bow and press it into the pad. It's been great for working out scratches and finish sanding.