Got all the fabrication done on the rear spar carrythrough parts for rear spar carrythrough bulkhead, including the F-705B spar strap, F-605C doublers, and seatbelt anchors. The new bar stock still had some milling marks, so I buffed them out with scotchbrite. Only had to take off 0.002″ or so – around 1 percent – of the material to get the marks out. Vans says that you can go up to 10 percent without issues, so I’m good with the replacement parts.