After the usual deburring, I used the drill press to machine countersink the #40 holes in the front of the F-01405F Brace.

F-01405N Seat Back Adjustment Guides

I separated the F-01405N’s and cleaned up the edges on my vertical sander.

You have to clamp them onto the Brace for match drilling. After a bit of head scratching I used a block of wood to help clamp them whilst allowing the drill room.

I just used the usual #30 100º cutter to countersink the holes for the AACQ-4-4 rivets.