A magnificent mod, I have one in aluimnium and I love it Practically does as much as the legendary GGTS, but does it better IMHO Plenty of spares always in stock, and I added a 901 adapter head cap to mine It's like having four different mods in one The next plan is to get an extra bottom tube switch assembly, for even greater flexibility A great piece of kit and well affordable in aluimnium :ac)