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those white metal-aluminum type bushings. Don't know if those are factory or not, they may be.

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Keep in mind that these instructions were used for engines that were designed to run 100,000 miles. Our hobby engines never last that long so using less precise methods might have worked fine for a lot of people.

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well, thank a lot, guys. now i'm paranoid. i've installed hundreds of these things, and never had a problem with clearance or spinning. i use an unworn driveshaft to drive the bushing in, and then spin it until it spins freely. hundreds (i'm old). i knew of the tool, never never knew anyone who had it, so i always made do with what i have. i never did ream or cut the bushing. maybe that's why i've gotten away with it?

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No you sized the bushing , maybe no the proper way , but driving it in wit han old shaft and spinning it till you could get the shaft out sized it, though you were lucky they didn't spin in the block i guess ?

I have thought about cutting a notch in an old shaft to make a sizing tool , similar to what some do with an old cam to size bearing after installed in a block .