Does anyone know if the tubes used for the gemini and polaris pens are the exact same and can be interchanged? (If I was more sophisticated in the tool department, I could "mic" 'em myself, but I don't have a "mic"!)
Instead of buying Capt.Morgan this weekend, go to your local Harbor Freight and get a digital 6" caliper for 16.99. You'll be amazed the # of things you'll find yourself measuring in the shop.