Seeking Answers To Crossbows and Quarrels in Use between 11th and 15th Century

Greetings Members of the Arbalist Guild, I would like to open by saying that I’m certain I won’t be of much assistance to this forum in the long term. And, in truth, I’ve only joined so that I might post a question and get some answers by knowledgeable experts. I’ve tried to do online research into crossbow information; yet I’ve spent at least six hours of my life in vein trying to find the answers to some rather obscure questions. I would greatly appreciate any ...