Mahmoud R Leesburg , VA August 16, 2020 Moldy smelly old bellow. Perfectly fine. The video posted on your site, with the step by step procedure, was the only reason I bought the bellow and took aim at changing it myself. In other words, the person who recorded the video was on point! 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes