Ruby steering wheel

[John Mason]

Hi,  you could try heating it but not with a naked flame. Use a heat gun or as as a home made tool get a socket that fits the nut (or if butchered like yours one that will tap on)and after putting it on to an extension heat it in a blow lamp or even in a domestic oven. When hot place on the nut and wait for the heat to transfer to the nut then see if it will turn at all. If you get movement treat like any tight nut or stud by slackening then tightening until it moves freely. Use plenty of penetrating oil.

John Mason