Being a hard-core fan of Doctor Who about ten years ago I set out to make a working sonic screwdriver and did a brilliant job of it. But somehow I lost both the screwdriver and the plans for it, so I'm rebuilding it from scratch and memory
What I am now noticing is that I had a 1" diameter part screwed into a battery compartment made out of a five inch section of nominal
1" aluminum pipe. Supposedly such pipe has an internal diameter of 1.0625" yet the part made out of 1" round aluminum bar fit perfectly. Is the inside diameter of Al pipe actually smaller than it's stated value or is bar stock a little larger in diameter than the stated 1"?Ron