We highly recommend using the silicone measuring band that we provided. We also suggest using lubricant when measuring your girth. When customers do re-order a shaft it has been reported that 25% of our customers re-order replacement shafts. 90% of the time, the new shafts are the same length, and the only difference is the girth is smaller. When our customers will re-order a new girth size it shows that 95% of the time the girth is always smaller.
Please review the below video on how to properly measure.