In Sarajevo it is, once again, the Year of the Rat.

"His darts cover everything from short fat ones to long thin ones."One diamond-coated dart took 18 months in production and we had chemists involved. But he went on to win a world title with it which was very fulfilling."

In 2020, Mr Huxtable designed darts for both the PDC and BDO world champions.Wright and Wayne Warren both credited Mr Huxtable for his help to make them the best in the world."Sometimes it might take years working with a player, other times you get a eureka moment and that can advance a player's game hugely," the engineer said.

"It could mean someone going from the top 32 and getting into top 16 and making the big time."Mr Huxtable is also making darts for another Welsh player - Jonny Clayton, from Carmarthenshire, who has won four titles with his darts.

"Jonny Clayton's game changed overnight and it skyrocketed to the next level," he said.

"He's a great character."He named it MittiCool or the clay that stays cool.

At $95 its affordable and now sold through 300 stores in India and exported to countries including the UK, Kenya, and UAE."Fridges are a dream for many poor families," Mr Prajapati says. "And such dreams should be within reach."

Mr Prajapati's innovation is part of a growing wave of grassroots entrepreneurship in India, driven by necessity.Prof Anil Gupta who runs the Honeybee Network, a platform for supporting such ventures, call these "frugal innovations".