hi daryl. i acquired a 507b with our house.. set it aside for a few years until an ice storm put it into service - had no clue, but got some heat. the 507b as a short arched base, spinner damper on bottom ash door, spinner damper on top/scuttle door for secondary air. my stove runs a hotter stack with wood, heats the casting faster. start adding blishack nut coal on top of your wood base. you will reduce primary/lower damper air. i have no hard and fast method for the secondary air, except to say that it should be open at least 1 turn, the rest depends on your draft situation. read up on puff back/explosions from opening a scuttle door without letting some secondary air mix first - very exciting, potentially very messy. we had the 507b running about 5 days on one light during christmas - my 14yr old kept it going... agree with the guys on the "character" of chips - the enamel changes color as it heats up, probably can't duplicate that out of a can. wipe up any retort cement right away. make sure the grate handle is included - need it to pull the ash pan. i can now fire for a weekend, or just an evening since i have it figured out. i enjoy firing with wood for a while before adding coal, but there is no benefit to adding wood to a coal fire. look for references to the blue ladies - very cool, but our lack is a window to watch them - i open the top dor a lot. enjoy!!