When I installed a new clutch on the MF240, I didn’t have the gauge normally used to set the clutch fingers, nor the factory measurement for the base height. So I had to think outside the box.
Luckily, I had a dial indicator with a magnetic base in the garage. I attached it to the tractor with the tip against the adjusting screw on one of the clutch fingers, rotated the engine by hand, and measured all three fingers the same way.
I adjusted the fingers until the dial indicator showed the same height on all three. The idea behind the method was simple: when the fingers are even, the release bearing contacts them at the same time and the load is distributed more evenly.
This method checks the difference between the fingers, but it doesn’t confirm that the absolute finger height is within factory specification. If you have access to the factory measurement or the correct setting gauge, use that as your reference.