The first step is to set the bow to the correct draw length and draw weight for you, for this guide I’m assuming you know what both of these should be. These two can be done in any order.
To set draw weight start by winding both tiller bolts (clockwise) fully in, but do not nip the bolts. Then, check in your bow’s manual how many turns can be taken out of the bolts. Turn the tiller bolts anticlockwise one turn at a time until you have reached your desired draw weight or taken out the maximum number of turns from the bolts. It is important to take out an equal number of turns from both tiller bolts. Your bow may have a locking screw that needs to be loosened before you can move the tiller bolts.
If you need a higher draw weight than you can get by adjusting your tiller bolts, put some twists in your cables, or take twists out of the string. This will increase draw weight and draw length and reduce your axle to axle length. Make sure you set the cam timing properly. Vice versa if you need a lower draw weight than your tiller bolts allow. Be careful with this that you don’t exceed the manufacturer’s tolerances for the axle to axle length of your bow as this can cause damage.
Setting draw length is unique to each bow. There are two methods of setting draw length, removable modules and rotating modules. Sometimes there will also be a draw stop peg that needs moving too. Make sure the length on the peg is the same as on the module.
Buy the correct size module for your draw length. Remove the bolts holding in the current module, then remove the module. Place the new module on the cam in the correct position and bolt it down. Repeat this process for the other cam.
Loosen the bolts holding in the module, then rotate it to the correct position. Tighten the bolts on the module. Repeat this for the other cam, making sure both modules are set to the same draw length.
If your draw length is between two modules, you can get further adjustment by playing with the number of twists in the string. More twists will shorten the draw length and reduce draw weight, less twists will do the opposite. Mybo bows have this adjustment built in to the module, so you can perform this adjustment without a press.
Cam timing requires a bow press, make sure you know what you’re doing before you attempt it as pressing a bow can cause serious damage if done incorrectly.
Draw the bow back slowly (preferably on a draw board) and watch both cams to see if they both touch the stops at the same time, or if one touches faster than the other. If one touches faster than the other then add twists to the cable that attaches to that cam. You want both cams to touch at the same time, on some bows (older or budget twin cams) this isn’t always possible in which case, get it as close as you can..
Fixing cam lean requires a bow press, make sure you know what you’re doing before you attempt it as pressing a bow can cause serious damage if done incorrectly.