On page 40 of my '61-'71 parts book there's a blowup of the kick starter. There is a part number 25C, which is 33153-60. I'm curious as to whether anyone has ever seen this part, and if so, what it's made outta. Steel, brass, aluminum, rubber, plastic? I'm also wondering if the outer diameter fits in the hole in the spring cover, or ir it's larger so that the cover rests against it. Any insight appreciated! Cheers.....Omar