Mast Slot Grind 09 Done and ready for launch

Just enough to get the gooseneck slider in there. Still need to test loading the sail to see if the slot is long enough. It might grow slightly in the future if reefing becomes common and easier with the longer slot, but this is good for the launch. The plans have the gooseneck about an inch lower than that position, so I think I'm good to go, even though my sail is 3 inches short.