It depends on what you are planning to do. Do you plan on being able to completely take down your bow (changing strings, etc)? Are you going to change servings, tie on things to your strings? Or you you mean, just being able to tune your bow.

If you are planning to tune your bow, all you really need is a good set of allen wrenches. If you are planning on paper tuning, you can build your own (I use a tree stand box with a window cut out on bith sides and tape the shoot through paper on it).