How to fix broken plastic scissor handle?

Hi. My husband has a small Wiltshire Staysharp scissor (about 6 inches in total length). I really like this scissor. I can use it to cut cloth or paper and it stays sharp. It has a hard plastic handle. The handle for the thumb broke. There is not enough handle left over to open and close the scissor. Crazy Glue does not work. Can someone suggest a glue that works on hard plastic. We can't find this scissor any more. Thanks.