No, your correct Trev, It's metric but I have to hammer the sockets on with a nylon mallet. I think it must be a combination of tight a fitting bolt set to begin with combined with some rust, yet I rubbed all the nuts and bolts with a wire brush till they looked clean? Thanks for the impetus to give it a more concerted try.

Here are some pix of the rust conversion I did under the deck. I used a sanding wheel on a small grinder and then Septone rust converter. Odd that the cutting disc bolts were an easy fit but the rest are a tight sizing. Actually, that's the other mower I bought for spare parts. The one I'm working on today is the blue one.

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