Rescue instructor Shawn Haynes sent me a box of bearings and a picture of Richard Delaney’s friction reducing micro-rollers wanting one built for evaluation during rope rescue training. Quick to build and turned out pretty nice. 8 ¾” overall length, 3 ½” wide and 2” high. Total weight is 1 pound 14 ounces. Sending it out today so he can put it to the test this weekend during some training to see if we need to modify anything.