southmshunter: 1)cam timing. When your crossbow is at rest (not in the cocked position), look down from above at your cam. Pick a spot where the cable crosses the cam toward the axle. Now look at the opposite cam in the same area. If the cable crosses the cam in the same area, the cams are in time. When cocking, center the rope cocker or if you use the crank cocking device, center it on the rail and careful cock the crossbow. When fully cocked, do the same check on the cams. If the cable crosses each cam in the same place, the cams are in time. If you do not center the cocker or crank cocking device, when cocking, one cam may be advanced more than the other. This will not only give the appearance of cams being out of time, but the arrow will not fly true. To adjust timing the riser has to be put in a crossbow press and then add or subtract twists to the cable.
2)cam leveling which you also want. At rest, lay an arrow with a field point on top of each cam, pointing toward each other at the rail. With the arrows held flat on the top of the cams, the points should match if the cams are level. You can also do this check when the crossbow is cocked. To level the cams the crossbow riser has to be put in a press and adjustments made at the "Y" axle end of the cables.
3)Barnett string breaking. Here is my personal experience with the Barnett Ghost 410. Due to fraying, serving separation and each cable made in two pieces instead of one, I changed both string and cables to 60X. My crossbow came with missing limb rockers and the cables were improperly installed. Instead of one cable lying above or underneath the other, they were wrapped around each other. In this instance, it is like putting the emergency brake on your vehicle, then trying to drive it. This causes extreme stress. Improper assembly and maintenance can lead to string and cable failure and later on possible limb breakage or cam bearing failure.
60X string and cables are very high quality. Since installing them I have shot hundreds of shots and have had absolutely no stretch, fraying or cable separation. If going this route, go to their website, enter your make and model of bow and if you have your manual, the string and cable length for your model bow will be listed. You can also get this information from Barnett website. Given the proper make and model of bow, 60X should also have this information. 60X will even build string and cables in multiple colors for a few dollars more if you wish. This company provides excellent customer service and I highly recommend them.
With any bow or crossbow, keep the string and cables well lubricated. For the crossbow, apply a light coat of lubricant on the rail.
All the best.