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OK I did some weighing today. The arrow is a feather fletched cedar, and I HAVE NOT shot this arrow for tuning with these weights I will quote, but am just putting the numbers out there to compare.
The wood arrow with a 125gr glue on point weighed in at 474gr. I actually MEASURED the steel insert I made up, it was 2.5″ long, not the 3 or 4 I thought. With an aluminum adapter on it, and it weighed 103gr. When the alum adapter was changed to a steel one, the weight came up to 177. Remember the shank of the adapter is cut off and the adapter drilled out and tapped for 8-32 threads. I used 1/8 thread rod so solid rod would most likely bring the weight to 180 or 185gr, but will go with what I have.
Total weight, with no head on it, now comes to 528gr.
Figuring one might glue on something like a 225gr Tuffhead, I added an additional 225gr point to the front. and this brought the total to 754, now we’re getting somewhere. The shaft is 28.5″ to back of head, so with center point being 14 1/4, the actual balance point is 7.25″ forward of the center point, for and FOC of 25.44%. Now if you wrapped it in a fiberglass footing, and coated that in resin, I imagine it would tip the scale over 800gr, and ought to be darn tough, for a wood arrow.
Anyway, that’s food for thought, since you were wondering about an insert inside a wood arrow for strength, hope this helps.