Imeo , about the GG4s , you mentioned before the possibility of using a fake battery like in ggtb , to be able to use 18500 bat.. You mean a battery extension to supplement the length up to 1,5 cmts . longer right ? Do you have that part made ? I guess its just a peace of solid plastic , 18 mm. diameter with a solid brass rod in the middle to extend the pole ( 5mm. diameter ? ) Do you have this ? Or I can make one thought . I have nylon rod i use in my lathe and some peaces off solid brass rods as well . Any particular instructions to make this ?