The linkages being perfect are very important to the success of your heli and advancement. If the heli is not close to perfect you will be fighting that heli instead of learning to fly. The specifications/measurements are there for a reason. Get a digital caliper and be happy you did.

Example: If you wear a size 9.5 shoe and you purchase a sized 9.0 more than likely you will be able to get your foot in it, but it will cause you to walk different instead of walking normal. You will have to work harder to counter the pain.

The same with a heli when setup of right.