The Caravela mod by HCigar is a 1:1 ratio replica that is offered in either stainless steel or brass with mixed accents. Each mod is laser engraved with the 'ship' logo and other markings much like the original. The mechanical mod includes 3 different extension tubes for sizes that will fit for 18350, 18500, and 18650.
Note: please DO NOT stack batteries as this is a mechanical mod with no circuitry, you will effectively double your voltage which can and will destroy attached devices. Also, have a clear knowledge of properly using mechanical mods.