Today, I looked for the small sheet metal dome cover that you described for me, but what I found on top of the pto housing was a small sheet sheet metal dome cover that sat on top of a metal tube that was about an inch tall and half inch in diameter that looks like a breather tube. There was no access cover with a nut. So I'm thinking this must be the clutch operated style, which you said is not adjustable. If this is the clutch style, how would get access to the clutches for replacement and is it a major operation? I'm a shade tree mechanic, but I like to fix things if I can. Can't afford to pay $100. per hour these days. THANKS AGAIN JIM LARRY frm MO