or you could just get these...
http://search.ebay.co.uk/search/search.dll?sofocus=bs&sbrftog=1&dfsp=32&catref=C6&from=R40&satitle=o+ring+pick&sacat=-1%26catref%3DC6&sargn=-1%26saslc%3D3&sadis=200&fpos=NE63+9DJ&sabfmts=1&saobfmts=insif&ga10244=10425&ftrt=1&ftrv=1&saprclo=&saprchi=&fsop=32%26fsoo%3D2&fgtp=
http://search.ebay.co.uk/search/search.dll?sofocus=bs&sbrftog=1&dfsp=32&catref=C6&from=R40&satitle=o+ring+pick&sacat=-1%26catref%3DC6&sargn=-1%26saslc%3D3&sadis=200&fpos=NE63+9DJ&sabfmts=1&saobfmts=insif&ga10244=10425&ftrt=1&ftrv=1&saprclo=&saprchi=&fsop=32%26fsoo%3D2&fgtp=