That is the HB carb. The body of the carb is aluminum. Those needle valves are tough to turn. My .61 is a pain too. It should loosen up with running. As to the glow plug - it should glow bright orange; however it might be contaminated from the break-in process. It's not uncommon to burn a plug up during break-in. I'd get another couple glow plugs just in case. What kind of plugs are you using?