Causes a permanent error with the brush frame. I put the factory parts back in and there were no problems. Updated 08/22/17. I will forward it to VacuumPal customer service. After reading my initial review they contacted me and sent me another kit to test. I've been using the new kit since it arrived 1 week ago. After installing new brush rollers I got a brush cage error. I picked off the yellow ends and cleaned them up. I haven't had any bugs since then and the product works well. Much quieter than the first set and no additional bugs so far. VacuumPal stands behind their product and got it right in the end.