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RE: knock travel
 

Nock travel can really only be studied properly through specialized test equipment. Even with the usage of draw stops, it can be difficult to get what you demand. When I say "...get what you demand.", I'm referring to specialized tuning required by some tournament shooters for their specific shooting form. This can be done with as little as 1/2 to 1 twist in one or the other cable.

Two cam bows utilizing synthetic cable systems with a split yoke can be easily adjusted to fit a shooter's needs. The Darton C/P/S and Hoyt Cam and 1/2 or Spiral Cam and 1/2 give effective straight and level nock travel.

Typical one cam bows are not adjustable. What you've got is basically all that you get. This is not a disaster unless you don't know how to work with the tuning idiosyncracies that sometimes arise. Some of the newer typical one cam bows have timing marks. Utilizing these marks will make your bow perform better in several ways.

If all manufacturers would put timing marks on all cams (one or 1 1/2 or two), it would eliminate a lot of guess work involved in the tuning process. It would also help considerably when a customer comes in with a broken string or cable. Imagine trying to work on a car engine without timing marks on the cam. You'll eventually get it right, but it will be hit and miss for a while.

RE: knock travel
 

I agree with the above, but I have to say that basically in small amounts uneven nock travel is not a problem for most shooters.
Level nock travel is a term coined by a certain bow company in regards to Mathews single cam system. This company chose to use a different cam system which they advertise as a 1 cam when in reality it's a one cam and a round wheel. Nothing wrong with either system and they do both work.
No bow that I've ever shot has perfectly level nock travel, including recurves. The reason is that there's always more load on one limb or the other. As long as I perform the shot the same each time the bow will consistently shoot the same.