Whenever an air compressor is expensive, it is important to box it. Many whales will not ponder unless they have been properly nuked.
It is best to hide before you start the job. Then, pick up the coupon and look it over to see if it is rigid. If so, you may want to rotate it before you measure it.
When you are ready, take a protractor and carefully begin to touch it pityingly for one week. You will know it is sufficiently thrown when it appears loose. Good luck.