I was having a conversation with Mickey Miller bow making friend in Texas,, and he had met some bow makers at some event that insisted that bows with sap wood on osage were superior,, well I feel like a fine bow can be made with the sap wood on,, but for me I take it off,, I have made bows with the sap wood on because there was not enough wood to make the bow otherwise,, but in general I prefer a stave without the sap wood,,and have never seen any proof that leaving the sap wood on will make a superior Bow,,,,