• They're 165mm though, which are quite scarce so I won't be getting them chopped

    There should be enough room to make a 1"×24TPI hole at 160mm in place of the 9/16"×20TPI at 165mm to fit some PD-7300s :-) There's a tiny bit of damage to the crests of the 1" thread on one side, it's not fatal but you can avoid it completely by going to 161mm

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