Hello all..I am rebuilding a cb 750 K4.. Thought i would share this small tidbit of info of my build ..I am rebuilding the speedo of my bike (speedo rebuild in SOHC thread) and found some cush washers that work GREAT! these were in the plumbing section of Ace hardware. Now these are just a touch thicker in the flange area and fits snug in the back of the speedo cup perfectly.. and are just alittle firmer(but still squishy) than the old deteriorated ones.pics follow ......More pics as build of bike progresses. Enjoy!!