Kiv, I talk with Pete quite a bit and more than once we've talked about the Mac's @#% muffler. I'm sure hes told you what I'm going to say here. Plug up the hole, drill for whatever large size pipes you want to use and put them out the top or bottom. Its really all we can do for now untill Pete finds a way to make them with less effort and time. AS far as putting the spring clamp back on, Its like working on drum brakes on a car. Hold the muff in place, attach the wire clamp in the front of the motor. Have the spring and wire clamp wraped around the muff and use a flat screwdriver with the free end of the spring looped over it. Put the tip of the screwdriver on the hook on the motor's head and push the srewdrivers handle away from you so the spring will slide down the screwdriver shaft and onto the hook. Thats it. Piper