@hoptimum - I have added quite a few roasting tube options since the last website update. Still need to get it updated. Here are two of my latest 14mm GonG tubes. The longer tube is 5-1/4" long with an adjustable position screen for $11. The shorter tube is 2-3/4" long with an adjustable position screen for $13.
Should be able to make about anything you like.
@flotntoke - Glad to have finally gotten to your name on the list. Looking forward to turning you something special.
@Andreaerdna - You are welcome. Happy to hear your HI arrived safely and you are getting good results. The ss tubes don't need very much material to work well. Hope it helps you save money.
Almost out of the old style units now. The performance is about the same as the newer style HI's. There is an old style unit that has been running 24/7 at my house that still works very well.
I changed the design to resolve some potential issues.
Cracking of the wood body is a result of a rigid metal sleeve/disk being placed tightly into the wood. The wood tries to shrink due to the loss of moisture from being heated and it cannot, so it relieves the stress by cracking. Exotic woods that are very brittle like bocote or purple heart are most susceptible to cracking. Wood does not just randomly crack. It always cracks with a purpose. If wood is kept at room temperature, it will shrink and grow as the room humidity changes. There will be no cracking as long as the wood is free to expand/contract. The new heater cover design has a base plate that is smaller in diameter than the hole in the wood so that it won't create any stress in the wood. That is why I don't require kiln dried wood for the HI and why the new style HI's don't crack.
Charring of the wood body is also a result of rigid metal sleeve/disk being placed tightly into the wood. The constant conduction of heat from being on 24/7 will caramelize/char the wood given enough time. It can allow the core to loosen over time. The good side to the charring is that the heat conduction rate is cut to nearly 1/4 for regular wood. The new heater cover design has minimal contact area with the wood and is firmly held in place with two 3/4" long ss wood screws.
I am currently working on another new style for the HI. It will have a 7/16" threaded hole in the bottom that is closed off with a removable threaded wood plug. This will eliminate the need for the bottom cap and I can make them just as short as the Mini. Will post some photos soon.