This is most likely the silliest question I have asked on here! How do you measure the length of a takedown riser? End to end? Alignment pin to alignment pin? Bolt hole to bolt hole? I don't know if there is a standard way to measure or if it varies from bowyer to bowyer. Several bowyers offer different length risers, 15", 17" 19" and so on and others go by model like Widow, PMA, PSA and a new shorter one that I don't know the name of. Any insight is appreciated and thanks! Mike