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Calibre conversion kits do exist. I think they could be for might be cases where people want to practice marksmanship with smaller calibers like a .22 https://en.m.wikipedia.org/wiki/Caliber_conversion_device

If it was me, I would go in, dressed smart casual, be on time, polite, own up to the issue, say sorry I forgot to get it renewed and I hadn’t realized it needed doing, inform the judge of any mitigating circumstances that might have distracted you and ask that because it’s your first offence if they could be lenient as there were no other aggravating factors (speeding, drunk, crashed car with injuries rtc).

Was the car or truck in pretty good condition ?. It’s what I’d try if all indications are you are an otherwise legal and safe driver. I’m not asking for you to answer to me, but they seem relevant to a judge. I hope things work out ok for you.

The only other thing I could think of is if someone could be a character witness but the court might not want to hear them.

Maybe you have a good reason to ask for the fine to be waived if you have sick kids etc, or have been saving for a worthwhile cause and this would be a major setback or a penalty like losing your license would make you unable to work or look after kids.

If you are pleasant and don’t make things harder then they might have discretion to adjust the penalty and decide to do so. But the law might also be written so the judge has no say in the penalty or a minimum penalty is required.

I know of some drivers over here if they have an established safe driving record they can write and ask for a speeding fine to be reviewed and possibly waived (if it was just a few kms over, cant see it work gor 30km/h+ over).

I think there’s also been a few cases where people who would otherwise have their license suspended over here get an exemption for work etc.