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"Minister of Information for the Royal Kingdom of $Tree"...
The common mistake people make when attempting to design something completely Idiot proof is to underestimate the ingenuity of complete Idiots.
On the Q2 (and all their straitline cam bows) the cam is draw length specific. The cams can be had in 1/2 inch increments. You can make small adjustments by twisting string/cable but you will loose performance.
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Never argue with idoits, you have to sink to their level and then they beat you with experience
As RobVos said, they come in half inch increments. They really can' t be adjusted too much from the set length. Twisting the cable/string usually gains such little adjustment in length, that it isnt worth it in my experience.
If you just need a little different ' feel' , and not a major length change, you may be able to fix it by twisting or going to a string loop.
As indicated above the cams are draw length specific, no real range of adjustment. Be careful twisting up the string and/or cable that you don' t put the cam out of time.