Looking to replace ceramic nozzle on Econoburn 100. Installed 2008, used and regularly maintained since then. After reading discussions, have concerns: Having never had to replace nozzle before this, how do I ensure I order the correct size nozzle? Would appreciate video, detailed instructions on replacement. Seems previous attempts to replace (viewed online) have had to chisel out old parts, and new parts do not seem to be "drop in" options. Some of those videos are a good 10 years old. Are newer replacement parts better? Northern NY (1 hour south of Montreal). Supply stores here do not carry parts and are unable to assist. Any suggestions? Have found parts from manufacturer (Econoburn), but want to be sure order correct parts from the start.