I used this tutorial. I accidentally cut the strips 1.5″ instead of 1″ (because apparently I have a hard time paying attention these days) but everything still worked out OK. And guess what? My boys took turns beating the crap out of each other with this thing for most of the night. Guess what else? They really didn’t hurt each other! Woo! If you’re in the SLC area and you want to make one and you’re having a hard time finding brown flannel, Fabric Center on Redwood Road and 90th South has it in flat folds for $2.99/yard.
My sewing machine, however, didn’t enjoy this project so much. It appears that there will be a bit of a delay in finishing the 2nd whip. Like 3-5 business days. And that’s if they don’t need to order a part.