8 3/4 rear end confusion

Just takes a dial indicator to set the end play. The green bearings don't need the buttons or an end play adjustment. They're not as strong a bearing by design, but, a pretty good one regardless. Just use two LH bearing retainers when using the green bearings. If either of the buttons falls into the housing, you HAVE to pull the 3rd member unless you can somehow fish them out with a magnet. Don't just leave them in there and get new ones or convert to the green bearings. Those buttons can jam into the gears and make a real mess of things if left inside.