The coal scuttle does not work well for filling my Harman Mark I. It is one of those lopsided bucket things, but it is too large compared to the loading door and its spout is not long enough and not angled right. I bought some 2-foot sections of 6-inch stove pipe, capped one end, and at the midpoint I bolted on a handle like you would use to lift a bulkhead door. I flattened the open end of the pipes just a little by squeezing. I use the pipes to reload the stove. They fit nicely through the door. Each pipe holds 20 pounds of coal, which is about right for recharging the stove after a 12-hour burn. I fill several pipes at a time and just stand them behind the stove so they'll be there when I need them. I used black pipe, so they are not unattractive (my stove is in the living room), though maybe not up to Martha Stewart standards.
I need to remove the end caps and replace them using some silicone sealant, because coal dust tends to sift out and soil my lily-white hands when reloading the stove.