hi, I want to makemy own longbow, I am gathering various woods to try, so far I have hawthorn oak cherry, I have feelers out for wych elm laburnum, juniper and yew. my question is about nocks, other than horn what else can be used that is allowed under the rues, ib have heard of silver (a bit rich for my tastes) can ally, brass or other metals be used. what about another much harder wood hickory?)