I read 3 different feather splicing articles(at least 2 in old PA Magazines). Two sounded like brain surgery and the other one said measure, cut and put together. Guess which one I used.
The critical thing about splicing feathers is to match the barbs. Be sure they are the same size and they will naturally mate up. I usually did a 1" white splice on the back end of colored, barred feathers. I found that only about 3, 1" pieces will come from a full length feather and match well with the back of the other feather I was splicing to. Pat