Had a Crosman crossbow for years used it with a homemade sinew string,thought it was a cool idea,and it shot fair,however,deep down never trusted the critter but I kept it for old time sake,non shooter now,metal fatigue in the bow was an idea that bothered me!Just bought a bear saga and interested in really working on them,Always been a gun guy built em,blued em accurized em,this system fastenates me too,what are the best books for technical knowledge on modern crossbows? I am a history buff and fairly familiar with the history,but I see a great deal of " Don't do this" and "leave this to the guys at the pro shops!" well they,like many of you ladies and gentlemen and gunsmiths and Mechanics got their tech knowledge from books and some source and as a fair gunsmith and mediocre mechanic ,I do indeed respect that a little knowledge is dangerous,therefore I seek to learn the ins and outs of crossbow tech.withan eye towards safely doing it.If anyone can point me towards some good technical books it would be great. I have learned already there is a great deal of conflicting info given out here from mouth to mouth encounters,( some from people who are respected professionals in the field with conflicting info from others in the field, )perhaps not truly facts but maybe opinions ?( Professionals should deal in facts right?) Factory manuals are great !Thanks for being here and any help is appreciated,sorry for the long wonder intro!