Assembled the F-1010 Bulkhead. Started putting all the manufactured heads on the same side, however i remembered the recommendation to put the manufactured head always on the thinner aluminum sheet, therefore i drilled out 6 rivets on the F-1011C-R and reverted the rivets in order to make sure the manufactured head is placed on the thinner side. Aesthetically it doesn't look pretty, but if these are the recommendations, i follow them.