Hi Em,
Honestly I've never found this to be an issue in my 40 odd years of servicing Model 45's. The self aligning bearing should be able to take that on board and easily deal with it.
I'm wondering if this chap is dealing with a machine that has got sagging rails as that's quite common.
So what this chap is saying is that the Kirby engines had a "higher than industry standard centre of shaft from deck position" opposed to every other engine manufacturer on the planet ? and that they put a hole in the side plate in one position to suit a particular manufacturer while they were also using an engine from another supplier at the same time and placing it off centre to the transmission shaft hole ?
Must admit this Sounds totally absurd, but anyway....................
I am going to grab an example from both manufacturers which I have on hand and measure the height of shaft from the mounting deck position, after that I will report back to bring forward my findings.
Cheers,
BB.