the measurements is just a guide but there is no possible way to adjust it since its a tappet type the only way to correct the measurements is by measuring it then doing the math (there's a formula on the manual) then plotting it on the diagram(also on the manual) to know the specs of the tub(tappet) that you need, this repair is a bit of a headache we have done this way back 2016 i think and even if you already got all the tappets specs that you need parts is not readily available for the reason that the measurements is so random dealers will not store this kind of parts, we ended up porting the tappet with thick shim to fit with the measurements.