hello .i have a 34 inch crash tender i am doing as a winter project, before i start i am getting all the little bits that are missing ( practically all of them) my question is while i found some old water cannons in my bits and bobs box,one is complete the other is missing its top , my question is were could i get a replacement top so i have the 2 cannons i need, pic 1 is the part i need ,or is it possible to make my own as funds are a bit tight, the cannons are metal