Rich, my Kings Pawn - basically a long version of your Falcon - is very tolerant of arrow spines. It's possible it would shoot okay with arrows spined for that 70 pound Kodiak. That would be worth a try. 10 pounds though.... That's an awfullywide gapto try and bridge with one arrow shaft.

I would definitely NOT try to shoot the Kodiak with arrows spined for the 60 pound Falcon. I don't see any way for that to work at all. I think it's likely you'll wind up having to use different arrows for each bow, but you'll never know until you try.

I'd recommend23/64" shafts for a little more arrow weight, especially for that Kodiak.

As far as tools go: I've fletched an untold number of arrows on a JoJan fletcher over the years. Got a Bitzenberger a few years ago and sold that JoJan though. I love my Bitz! The best tapering tool there is is the Woodchucker grinder. If you've got a disc sander, you can make ataperingjig for it.Best hand held pencil sharperner-style tapering toolis the Tru-center.

You can go whole hog and buy dip tubes and a cresting machine, but it's not necessary. I've made literally thousands of arrows and never dipped an arrow in my life. The finish on my arrows has always been wiped on or sprayed on. Used to use varnish until they came out with polyurethane.

Feathers are pretty much personal preference. I like Truflight best because they are more consistent with the grind on their bases, but I also use Gateway. It really and truly doesn't really make much differene.