Some realy great catty makers on sling shot forum,If you look @ some of designs,you can see where some of the english lads get Idears from...So easy to just print a design off there and copy it in crossply. (RK ).I like bill hayes designs ,hwark has some great info and a wicked soh ,,Ive spoken to loads of these blokes online, I would say catty or slinshots us term is bigger in US,shefield cattys jim would be best to get info on ssf