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How I used to do it is with Razor's restock agents. I would have two restocks set up and one organize.
First you set the shafts as a restock, with the amount of 100 (Restock Agent 1)
Next you set feathers as a restock, with the amount of 1 (Restock Agent 2)
Then you set your organize agent for arrows, to keep your weight down (Organize Agent 1)
Finally you should record it something like this:

Restock Agent 1
Pause .25 Sec
Absolute Target
Pause .5 Sec
For Loop (100)
Restock Agent 2
Pause .25 Sec
Absolute Target
Pause .5 Sec
Double Click by type (tinker tool) - This is in case for some reason the gump gets closed
Wait for gump - Change the timeout to 1 so if there is an issue it doesnt hold up your macro
Gump Response (Button 21) - 21 is always make last item
Wait for gump
End For
Organize Agent 1
Pause 1 Sec

Now you may notice what seems to be unneeded pauses in there. Truth is Razor agents can crash UO like a champ. I find the use of delays like that will prevent crashing.

Anyways, hope this helps.