Here is 61lbs bow....u can see the last fiew inches...they are pretty narrow....its better if u leave the tip a little thick and verry narrow....this way the mass is verry low....
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Here is a 45lbs R/D bow.....i hope it helps...
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...both tips have at the noks, arrounde 6-7mm. wide maximum....u dont need to make the bow at the noks, wider thenn 10mm. max...only iff wi are talking aboute warr bows....the situation changes a little there....