hmmm, the crow's foot has a 3/8, 1/4 (or possibly a 1/2) square hole in one end and a open end wrench head on the other all about an 1 or so long. Now since there is no lever as such in use by way of the crow's foot in the operation of torque wrench then there is no increase/decrease in the application of torque over what is indicated on your torque wrench. Where I work there is an enormous amount of technical guidance on the use of torque wrenches and their appliction of such. We use crow's feet often and do not change the torque value applied when doing so. Either way a 12-24ftlbs variance is quite large and leaves room for error. Good and snug I always say.