Short VS Full Collar
When pivoting the Lever, Short Collar (Green) and Full Collar (Red) has different point of contact, this makes you need to make adjustments for the shaft size if you are swapping Short and Full Collar.
EXCEPT 9.5mm shaft, it is the only shaft size the makes contact on both Low and Full collar with the same angle.
We have make some calculations that you can use as reference to adjust the shaft size. This reference only applies to Golden Lever ecosystem, as other lever can have different pivoting point and makes the calculation not accurate.