I have inherited my mum's old pinking shears. They're quite blunt (I suspect I may have use them on paper as a child...) so I thought I'd need some new ones and had a look on eBay but I was suprised at how many "vintage" pairs are being sold. I can only assume they're as blunt as mine and so I wondered if you can get them sharpened anywhere? Or should i just get a new pair?