Super Fox HE with 2.5" chambers?

[David Noble]

The proper way to use the machinists scale to measure the chamber is to hold the barrels up to light while sliding the scale into the chamber, keeping the scale flat against the chamber wall. When the end of the chamber is reached the scale will lift as it enters the forcing cone allowing light to be seen beneath its edge. With practice this method will allow extremely close measurement of the chamber length.

[Bill Murphy]

I just look at the scale as it approaches the shadow. When it touches the shadow, I attempt to take a measurement. Will, I hope you are the lucky buyer.