Checked C C Specialties and Houtz both out of stock. I checked Jeff's site and didn't see what I need.
A little background. I'm 82 and not in the best of health but can handle stand up work, I can get down on the ground, getting up again is another story. Between the abdominal hernia and vanishing muscles, getting 220lbs off the ground is a chore without help.

I can change deck and mule drive belts from a standing position. Gave myself a pat on the back for that one.
The rod that goes down the handle shaft has slipped way down. Pushing it back up, I guess I'd have to drop the deck and crawl under it to get at it.
With all that said and part not available, I think I'll just use the stopper to set the cutting height and keep rolling. Thanks for the responses. You guys are great.