All of the above methods are great, and will all work judt fine. Before you pull the coil though, heat the coil on a glow plug ignighter for a couple seconds. This will make the coil more less brittle, and you will have much success. I have found Rossi #8s to be the best. Other plugs have a 8 thousands coil but the Rossi #8 has a 10 thousands could. The last longer, and will work withe heaters with voltage with voltage of up to 2.5 volts. Using these plugs, you should not have to change it for the entire season, if you need to change it at all at that point.
Good Luck
Happy Holidays

John Ligons
US MicroJet LLC.