I was told to measure my MQ32 from axle to axle when a new string of proper length was put on. If the string stretches/creeps, and it will if it is a Zebra Twist, then the A.T.A. length will increase.

The only way I know of to get a back-up string that is pre-stretched is to shoot one until it is broken in, carefully take it off the bow and put it away. Then put a new string on and break it in==>retune, etc...

I think you might run into hassles if you take the string off your bow just to check its length.

The Mouse