Quickest method, and best to keep fethers on for me, has been the tie-on (the one Art is refering to).
Take three fethers, and a 5' long piece of thread with a slip knot on one end. SLip the knot over the tab of the cock feather, wrap around it again, and place the other two on with two wraps each. Once all are wrapped, wrap up to the selfnock, and then back down to the feathers- there is space between my wrappings of thread.
Once you get back to the feahtes, pull it under a prefious lop so none of it will come loose, then bring the thread down throuwhg the bristles toward the front- three or four revelutions should do it. Once you get the front, loosely wrap around all three and slip it back under a previuous loop again. Now pull all the feathers straight and tight, then twist them all at the same time to give it some helical. Tightly wrap the front. Apply pitch to the thread and glue along the quills.
Total time: about 5 minutes.
I really like it, except having to wati for the glue to set (I don't have anywhere to place them except leaning against the wall).