Here are some pictures of the screws and muffler. The 1st picture is the tube that goes into the muffler showing how much room is left if I drill it out for larger screws. The second shows how much bigger the hole in the muffler is compared to the screw and the 3rd picture shows the screw on the left that came with the tube, middle to small also (showed for comparison) and the one on the right will screw in 1/2 turn. Probably wrong thread pattern on that one.
