I am unfamiliar with the term spigot bearing; but, I will speculate that you are referring to what is called a pilot bearing on the west side of the Atlantic.
I am working from a 1971 140 parts manual; but, I speculate that the BW35 set up is the same as exists on the 1800ES. For the BW35 version, the parts manual just refers to a guide bushing (part 28 a) which I am going to guess is pressed into part #28. You could remove part #28 (including 28a) which is thru bolted to the carrier plate (part #26); but, since the whole carrier plate assembly is being replaced by the M40/M41 flywheel that seems unnecessary.
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